Posts Tagged ‘leechblock’

[Update Nov 15 2011] : Chrome Nanny is now Nanny for Google Chrome. It also has a new home. The link to Google Chrome extension gallery is https://chrome.google.com/webstore/detail/cljcgchbnolheggdgaeclffeagnnmhno . Please spread the word !

 Chrome Nanny is a leech block like extension for Chrome. I developed it as I started using Chrome extensively and there was no leech block like extension for it. It has been kinda successful beyond my expectations – Almost 2000 people are using it ! I have been for the last couple of months with my masters and did not add any features. Now that I am free I thought, I will add a page which will show the features that are in the works and also provide a way to request new features.

I plan to make this page a single location where you can see the features that are being developed and also to request/discuss new features. Till the end of August 2010, I plan to have a weekly development cycle and after that probably once in two weeks – assuming there are some features to develop.

If you are interested in sending your patches , please email me to saravananDOTthirumuruganathanATgmailDOTcom.  The latest code can always be got from the repository here .


[Last Update] Update Jul 24 2011


One of the pain points is the initial setup. Chrome Nanny starts enforcing blocking behavior immediately after blocksets are created. If you make a mistake and you want to fix it, you have to enter the challenge text. Is there a heuristic that prevents challenge till the entire initial setup is done? ie I want to balance usability with the Chrome Nanny’s default behavior for productivity.


Features : In the next release

Vlad,Mathias : It is too easy to add a Whitelisted URL to the list. It can be done anytime, even when “You should be working”
I suggest to add the same check: if(chrome.extension.getBackgroundPage().BackGroundManager.checkIfBlockSetShudBeBlockedNOW(blockSetName)) challengeUser(blockSetName,’E’); to the function addUrlToWhiteList()

Jason : Perhaps it should be clear that the blacklisted sites are automatically tracked? Or perhaps the whitelist should just be a list of sites to track in addition (since isn’t the blacklist supposed to act like a whitelist too?)

Catherine : I have a suggestion, though. It would be nice if you had a feature that blocks ALL websites except those that the user specifies or puts in the whitelist–like the “Nuclear Mode” in StayFocusd.

Saravanan : Add purge option to Stats

Scott Allen : The main feature I miss, though, is a quick/easy way to block a site. What would it take to have a "block this" bookmarklet? Right now, I have to go through 3-4 mouse clicks, and then either copy/paste the URL or type it in. I’d like a one-click "Block domain" and maybe another "Block URL" one. After all, the whole point is to improve productivity, right? 🙂
Discussion : When you click on the Chrome Nanny’s icon page, it will have an option to block the domain/url. Clicking on it will take you to the options page. Also have a link to go to options page directly and for lock down.

Stricter time validation .
Mustafa :
Add the option to hide the blocked sites but show the allowed remaining time for the other ones. 2 reasons behind it:
-Everytime I see that blocked list I wanna disable the add-on and visit the sites. -I want to be able to see how many minutes do I have left for the restricted sites.

Anonymous : Add an option to password protect viewing Chrome Nanny options

Features : In the near future

Marko, Rajiv, anonymous : I would only echo what has already been brought up, that when you first start Chrome, it will let you see a site that you have blocked.  For example, I have blocked Facebook for certain hours during the day, but even during those hours, when you first start Chrome, Facebook pops up and you can see it until you click somewhere on the screen.  Then the Chrome Nanny block page shows up.  Still love it!  Just maybe a little hole to fix 🙂

Jim,Ben and many others :    Have a block behavior similar to leechblock.  I know leechblock as the option of limiting my facebook usage to 30 minutes ONLY on saturdays, and to block it every other day of the week . Is there a way to add that onto this extension? I really need it to help me out, because even 15 minutes everyday is too much for me at this point.

David T : It would be cool to be able to block a site based on the number of visits. I spend way too much time checking gmail to see if there are any new messages. Even though I’m only briefly at the website because there are no messages, it’s interruptive when I should be focusing. It would be cool to limit gmail to 2 or 3 visits per day, but be able to stay there and write emails if I’ve actually received something.

Tianyi Cui :        I propose a feature to use a custom JavaScript function to determine whether a website should be blocked.

        The parameters of the user-input function are an URL and some statistics about this URL (e.g. The logged time intervals of that domain in previous 24 hrs). I’m not sure how much statistics should be calculated and provided to balance configurability, performance and the time to implementation. I’ll think about it later and we can discuss. The statistics should be calculated only if needed (i.e. the parameter is a function) since probably most time we only need the URL and current time. The return values of the JS function can be either “Block”, “Don’t Block” and “Pass” (i.e. let the default rules to determine).

        This is an advanced feature which can be extremely useful for programmers (I bet a significant part of users are), as they can easily implement the feature they want by themselves, and the customized rules as JS function can be easily backed up, version controlled, and shared as it’s just plain text.

        I would like try to implement this feature by myself since I’m an experienced programmer. I don’t know JS very much and haven’t implemented browser extensions before. But it’s a great experience to hack and learn.

        Please comment on this idea and tell me which part of the source code I should read and modify and any suggestion on the implementation. 
Tianyi Cui :
        The challenge test should be prompted after user clicked “Save URL” (not after user clicked “Edit”) if and only if the edit could make a previously blocked URL not blocked any more (e.g. user is deleting URLs or reduced Block Time). When user is just adding URLs or increase Block Time or edit Tags, she should not be forced to the challenge test.
Brian :
        From: http://xkcd.com/862/

        “After years of trying various methods, I broke this habit by pitting my impatience against my laziness. I decoupled the action and the neurological reward by setting up a simple 30-second delay I had to wait through, in which I couldn’t do anything else, before any new page or chat client would load (and only allowed one to run at once). The urge to check all those sites magically vanished–and my productive computer use was unaffected.”

        I wonder if such a feature could be added to Chrome Nanny? Instead of blocking pages, make them load slowly?
Greg :
        A suggestion: When I’m on a site that is being timed, the Chrome Nanny icon should change — ideally it should be very dramatic (like all bright red) so I will notice that I am using up my time.  That would be a good warning not to stay on the site too long.  (This would also help when I leave a tab in the background that is eating up my time.)


Bevans : Could you give us a way to change when a new "day" begins? Right now, it’s set at midnight of course, but I sometimes work until 1 or 2 AM, and if I’m using a site at midnight I begin using up the next day’s time. I’d like to be able to set it to reset the timers at 3 or 4 AM instead of midnight.

Lukasz : Personally I like the "StayFocused" behaviour in this regard where you get icon that changes from blue to red if the current site is on the list and then counter once there is less than a minute left. It’s clear indication I’m on a site I shouldn’t and that the time is ticking 😉

Saravanan : Implement notifications feature. (http://blog.chromium.org/2010/05/desktop-notifications-now-available-to.html)
Discussion : Notifications are a cute little feature. It would be nice to warn users that they have only for eg : say 5 minutes left. (Should this be made configurable ? )

sarah : Suggestion: If I block, for instance, http://www.example.com, your extension also blocks http://www.differentexample.com, presumably because you strip it to "example\.com" and add a wildcard up front to ".*example\.com" This is really bad – you’re blocking a completely separate domain, when you probably just wanted to block "same.example.com" You could try using a url parser library to get the actual domain name. Thanks for an awesome extension!
Discussion : Good observation ! The current behavior was intentional so that user enters only "google" to block all of google’s websites.  One possible compromise is to check if the block url resembles URL closely – If so block only the URL. If it is a substring/regexp, use the default behavior.

Ryan : add idle state task to roadmap – refer : http://code.google.com/chrome/extensions/trunk/idle.html

Patrick,Allen : i think that websites should be able to appear in multiple block sets so that they can be blocked at different times on different days (eg. I want to block a website in a specific time period during the week, but in a different one on the weekends.) leechblock, on firefox, provides this option
Discussion : Another change that might result in major design changes. Depending upon the demand, will make the decision.

Firefly,Adam,Michael :     Is it possible to implement the export / import feature from Leechblock? I have an extensive list of sites (about 150) that I use in firefox. I use this list across machines and I’d like to be able to use it in chrome nanny.
Discussion : If there is additional demand , will develop this feature.

Tom : Is there a way to set the time limit to only be active during specified time ranges? For example, from 6am-9pm I’d like the 30min time limit to be active when I visit a blocked site, but after 9pm I’d like the blocking to become inactive and be able to visit the site as long as I want. If I could request a feature, that would be it.

Scott :     a) Could use natural text parser for time of day. (i.e., just enter 8am-5pm) b) If you have a long list of URLs in a blocklist without any word wrap breaking characters, it will make the block set box in the block sets tab really really wide so you have to scroll to see the "Edit" button.

KelAt :
    It’s not a big deal, but my suggestion would be for either of two changes to be made. Maybe I was already clear about this, or maybe I wasn’t:
– Right now, if I have a window with multiple tabs being blocked. Each one, however says “You can click here to access the page once the site is no longer blocked.” but it gives the same link on each page. It would be good if each page could keep the correct link to go back to the page that was blocked.
– It would be even better if the blocked page could just be restored / refreshed automatically after the block period has ended, so that when I return to the browser, I’m not confronted with lots of "blocked" tabs that I have to just close out of or refresh automatically.

Haitrieu :
    How could I sync this extension setting and statistics between home computer and my company computer?
    one other thing. how about allowing javascript in the redirect URL – so, for instance, I could send anything that’s blocked to instapaper before it goes and read it later?
    Right click might be hard for extensions like Chrome Nanny due to Chrome’s extension architecture. I will add an option in the popup page .
     I like the idea of an option to adding to a new url to existing list without raising the challenge . I will implement it in next iteration.
     I’d like to have the blocked URL in the URL line, so the blocked URL can be bookmarked easily or used by other plugins (like read it later or similiar)
     Max Time: add a option so I can only limiting the time between in a time range e.g. “X minutes every X hours between 0900-1200,1300-1700?
     support for Complex rules
    Combine the idea of adblock plus’s "list" subscription (they keep a running list of known ad sites) with Chrome Nanny.  But your lists could be news, social networking, , etc.  Then one wouldn’t have to block the whole internet, but just, say, "news".

Tim :
    Add an option to track time spent on links clicked from blocked pages.
Angelo :
    I would like to be able to schedule a ‘break time’ each day, during which I can freely browse my blocked sites without accruing any minutes against my time limit. For example, I give myself 30 minutes a day to use up on browsing my blocked websites, but from noon until 1pm, I can browse as much as I want. Maybe, you could implement this as a "Active Time" setting in the general options, which defines during which times the Chrome Nanny extension is active. I could set up my "Active Time" as:  "930-1200,1300-1700" for example.

Jared :
    Great app, but if there was one added feature, I’d be happier.  In Leechblock, whitelisted URL’s can be added to a particular block set, rather than only in an independent group that supersedes all blocked lists anywhere.  Can you see the advantage in doing it that way?  For example, the scenario that works for me at home is the following: one block site blocks the whole internet 24/7 EXCEPT for a select few sites I allow (email, google maps, wikipedia, etc) that I know not to be the major time drainers.  A second block set blocks EVERYTHING starting at 10 pm so I must get off even email and go to sleep (and this block set supersedes the whitelisted url’s in the previous group).

It took me a while to figure this system out (it’s not necessarily intuitive to consider a hierarchical approach), but it is the best, most customizable way to do it for me.  It’d be great if this feature could be added (could even leave the white lists tab as it is, but just add in the ability to white list within each block list)

Completed Features

This will include the list of features that were discussed previously. I will include the version number and date it was deployed.

Features : Set 1

Completed by August 22. Chrome Nanny version 0.964.

Arnaldo : I see what you are trying to do, but could this popup be a configurable option?
kunigas : Let the password requirement for editing as an option (and also the length of it too), I’m fine without pass, but I find it annoying to type it every time I decide to change the blocking rules (and I do it often in experimental periods).
Discussion :
In the general options, add a drop down to decide how the challenge has to be implemented. Possible values include a) No Challenge b) 32 character c) 64 character and d) 128 characters. By default challenge will be 64 characters. If you increase the challenge size, you will be allowed. If you decrease it, then you will be asked for a challenge . For eg , if you try to reduce a 64 character challenge to 32 characters, you will be asked a 64 character challenge.
If a block set is currently being blocked , then trying to edit / delete will trigger a challenge that is specified in general options.

Saravanan : sort blocksets by name atleast when displaying so that the order is consistent
Discussion : This is more of a usability issue rather than a bug.

Features : Set 2

Completed by September 20. Chrome Nanny version 0.98.

Peter,Lukasz,Scott : Would it be possible to have the option to ‘hide’ the list of blocked sites – so that not everybody who goes on my computer could idly click on the nanny icon and be presented with a list of all the sites I’m not visiting.

Discussion : Allow an option to make the information available in the Chrome Nanny icon optional. Should this be extended to control the list in options menu ?

Yavor : jquery’s datepicker – I cannot see the arrows on the top of the picker – they are blue on blue.
Discussion : This is a UI issue and might confuse some users. So, highlight the arrows in the calendar to change the months more clearly.

anonymous : I think the way it lists the times are kinda weird… if I have 5 more minutes on a site it says 00:05 hours.  At first glance it is kinda confusing.
Discussion : If remaining time for a URL is less than an hour display as "x minutes left" . If greater than an hour display as "x:y hours left" .

Sarah : This extension can render the browser unusable (without running from the command line) if a user blocks their homepage with "close tab" selected as the block method. I suggest defaulting to loading about:blank instead to avoid this problem.
Craig Kingston :  The mode of blocking defaults to closing the tab, which is surprising and confusing.  While I am able to redirect it to some specified URL, it would be nice if a third option or at least a default specified URL was a "default -this pages is blocked- web page" (similar to leech block).

Discussion : I will check if it is possible to redirect to about:blank. If not I will redirect to a new page similar to leechblock’s. This will be the default option for new installations. The current settings will not be modified.

Features : Set 3

Completed by Jan 24 2011. Chrome Nanny version 0.984.

Tim, Saravanan : Allow a more expressive block times. For eg instead of block after 60 minutes in a day allow other options like block after 60 minutes in 4 hour/6 hour/ 12 hours etc. I think Leechblock has this feature. Emulate as closely as possible.
Discussion : These two features might need some major changes in the design of Chrome Nanny but looks like very useful features.

Features : Set 4

Completed by Mar 06 2011. Chrome Nanny version 0.988.

Matt : The ability to go into "focus mode", and block a specific set of websites for a specific  amount of time.
Saravanan : Have a feature similar to Leechblock’s lockdown.
Discussion :
The idea of focus mode and lockdown are very similar – The only difference is that focus mode can involve arbitrary sites not in any of the blocksets. There must be some way to enter a set of websites and ask them to be blocked for the next n minutes. In lockdown, all the sites already in Chrome Nanny block sets are blocked for the next n minutes. In both the cases, the user will be specifying the block time.

Features : Set 5

Completed by Jun 19 2011. Chrome Nanny version 0.989.

Fixed a bug in lockdown.

Features : Set 6

Completed by Jul 24 2011. Chrome Nanny version 0.990.

Galen,Toni,EC,Neil,Corey Helfand : .* blocks, among other things, chrome:extension — this is probably bad behavior. Probably shouldn’t block any urls that purport to use chrome as the scheme. Do not block chrome:* and chrome-extension:// pages.
Eric  : Prevent .*.* from being added to the whitelist.

Robust handling of erroneous regexp – When entering regular expressions in black or whitelist, it is validated. Existing incorrect regular expressions are also handled gracefully.

Prevent *.* from being added to Whitelist

Always allow access to Chrome internal pages even if *.* is blocked. This will allow access to , for eg, Chrome extensions page.

Dont strip www/http from url/blocked url. So www.ft.com will not block www.microsoft.com unless the url is ft.com .

If there is any other features you are interested in, please feel free to share in the comments or in the Chrome Nanny’s extension page !


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This is a short post to announce that a new version of Chrome Nanny is released. This version incorporates the much requested feature of “Block Sets” .  It also adds a couple of new minor features, new chart types etc.

URLs :

Installation : Chrome Nanny’s extension page.

Updated Instructions : Instructions For Chrome Nanny – A Leech Block like extension for Chrome .


Check out the extension and tell me your experience !

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[Update Oct 12 2018] : Thank you  for using Chrome Nanny. It is not available in the app store. It uses an old version of the Chrome extension API/manifest. Unfortunately, I do not have time to update it. Please consider other alternative extensions. Thanks!

[Update Nov 15 2011] : Chrome Nanny is now Nanny for Google Chrome. It also has a new home. The link to Google Chrome extension gallery ishttps://chrome.google.com/webstore/detail/cljcgchbnolheggdgaeclffeagnnmhno . Please spread the word !

Leech Block is one of my favorite Firefox extensions. When I made the switch to Google Chrome, the lack of Leech Block like Chrome extension was annoying. In one of my old blog post Two Chrome Extensions I wish Chrome had !! , I had mentioned that the two extensions I miss were Leech Block and one which can track my browsing habits.

I waited for quite some time for some one to make a Chrome extension and then decided to write it myself. Google has a good API documentation and tutorial – so coding was not that hard. In the process, I learned lot of interesting stuff – and my admiration for Chrome has only increased.

What Is Chrome Nanny

Chrome Nanny is a Leech Block like extension for Chrome. It allows you to say don’t allow me to go to a particular site during the time you specify. You can also limit the maximum time that you spend on a site. This means, that you can say you do not want to be allowed to go to facebook.com from 9-5. Even better, you can say don’t allow me to spend more than 1 hour during the time facebook is not blocked (12 AM -9AM, 5 PM – 12 AM). This is probably , the most common way Chrome Nanny will be used. Also you will also not be allowed to edit or delete a blocked URL during the time it is blocked.

If you want to check out the extension, please try it out at Chrome Nanny‘s Google extension gallery. If you want to read the instructions and its features, check out Instructions at Chrome Nanny – A Leech Block like extension for Chrome.

If you try to access a site during the time when it is blocked or after your daily quota is over, you will not be allowed to visit it. By default, Chrome Nanny will close the tab. If you like, you can also redirect the tab to  go to some motivational site. For eg, I make my Chrome Nanny redirect to ocw.mit.edu. Whenever I see that ocean of knowledge, I get a guilty feeling and start to work again 😉

I also added a feature to track the time I spend on some sites I commonly visit – digg, nytimes, hacker news etc. These are the sites, which I do not want to block , but I want to know how much time I spend on them. In Chrome Nanny, these sites are called White Listed Sites. You can add a site and the system will silently start tracking the time you spent on those sites.

Tags are another of my favorite feature. You can create tags to group URLs. For eg facebook and myspace may be in social networks, google reader and technorati in blogs etc. A tag contain multiple URLs and a URL can have multiple tags. Tags are most useful when you chart the time spent on each broad activity (like blogs, news, work etc ).

Chrome Nanny also has a basic charting system. It can provide three charts : Blocked Urls, White Listed Urls and Tags. Each of these can be drawn as a bar or pie chart.

Chrome does not have any easy way to determine if the Chrome tab/window is minimized. This means that it is hard to know that the user is not at the desk. For that, I have an maximum inactive time in General Options. For eg , if it is set to 5 minutes , and there is no activity in Chrome for 5 minutes, then Chrome Nanny stops tracking. In fact , it even gives back the 5 minutes !

If you want to know how much time left in your quota , you can always click on the Chrome Nanny’s icon to see the URLs blocked and allowed now. If an URL is allowed , then it also shows how much time left today too !

Comparison with Stay Focusd and Rescue Time

I noticed that there are two extensions that have functionality similar to Chrome Nanny. One is Stay Focusd and other is Rescue Time. Both are fine extensions. You may want to select the most appropriate extension based on your needs.

Stay Focusd has a single block time for a whole day and all the blocked URLs share this limit. In Chrome Nanny , each blocked URL has individual block time and max limits. In Leech Block parlance, all the Stay Focusd URLs form a single block set while in Chrome Nanny each URL is its own block set.

Chrome Nanny can do the job of Rescue Time partly too ! If you add the urls you want to track in White Listed URLs, then Chrome Nanny will count how much time you spent on each of them. Rescue Time on the other hand tries to track and analyze any url that you visit.


I had used jqplot  for charting. It is an excellent charting system and was very flexible. The icon for Chrome Nanny is obtained from the icon set of Smashing Magazine .

Also a special shout out to Suresh, Lokesh, Ashok (who also suggested the name !), Kripa, Divya and Arvi who helped me to test the extension and gave useful suggestions. Thanks a lot guys !

Do check out Chrome Nanny and tell me your opinion !

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[Update Oct 12 2018] : Thank you  for using Chrome Nanny. It is not available in the app store. It uses an old version of the Chrome extension API/manifest. Unfortunately, I do not have time to update it. Please consider other alternative extensions. Thanks!

[Update Nov 15 2011] : Chrome Nanny is now Nanny for Google Chrome. It also has a new home. The link to Google Chrome extension gallery ishttps://chrome.google.com/webstore/detail/cljcgchbnolheggdgaeclffeagnnmhno . Please spread the word !

Prelude :

I have written a Chrome extension which kinda does some very basic stuff that Leech Block does for Firefox. I also have added some more features (like tags, charts) to Chrome Nanny that makes it more usable IMHO. If you are interested in checking it out, check the Chrome Nanny’s entry in Google Chrome extension gallery.

When I published the extension , the site asked for a web page with instructions for the extension . Even though , I had included instructions in options page of the extension, it makes sense to have  the instructions in a website too . Hence this post !


1. The features that are planned to implemented are listed at the page Chrome Nanny Road Map .

2. This post will be updated as and when new versions of Chrome Nanny are released.

I have put the most commonly asked questions in the FAQ.  Please take a look at the FAQ and the comments to see if your issue is addressed. If not please feel free to comment on the post or Chrome Nanny’s extension page.


I have added some FAQs based on the comments in the blog post. I will keep them updated as the comments evolve.

1. How do I block a URL (eg : http://www.facebook.com)  for a specific period of time ?

Lets say you want to block facebook between 9AM-5PM. Go to Chrome Nanny’s Options page and select Blocked List tab. Enter facebook.com in the URL. Convert time to be blocked to hhmm format in military time. It becomes 0900-1700. If there are multiple times, then append them with commas. Eg 0900-1200,1300-1700.  Select the days on which facebook has to be blocked. Click “Save URL”.

2. How do I limit accessing facebook to 1 hour a day ?

Suppose you want to access facebook all day but want to limit it to 1 hour at the most in a day. Go to Chrome Nanny’s Options page and select Blocked List tab. Enter facebook.com in the URL.  Enter 0000-0000 in the Blocked Time. Enter 60 in the “Max Time In a Day”. Click “Save URL”.

3. How do I block a url for specific interval but also want to limit the time spent on it in a day ?

This is achieved by a combination of 1 and 2. Lets say you want to block facebook between 9AM-5PM. In the remaining time you want to limit your browsing to 1 hour. To do that, enter facebook.com in the blocked URL , block time as 0900-1700, max time in a day as 60.

4. How do I block all .org sites except wikipedia ?

This can be done using regexp. In the block url , enter .*.org as the url. Enter the appropriate block times and save the blockset. Now go to “White List” tab and enter “wikipedia.org” as white listed url. Chrome Nanny will block all .org sites except wikipedia.

5. Is http, https, www needed ?

No. They are really not needed and Chrome Nanny internally strips them when doing the matching. So facebook.com will block facebook and there is no need to enter the full URL as http://www.facebook.com .

6. Chrome Nanny Crashed my Chrome

Open Chrome Nanny’s options page. In the “General Options” tab,  check the value of “Mode of Blocking”. If it is remove (default) then Chrome Nanny will close the tab if you try to access a blocked URL or if your daily quota is up. If there is a single tab in the window, it might look Chrome has crashed. It has not.

7. Chrome Nanny closed my tab

Chrome Nanny’s default mode of blocking is to remove the offending tab. If you want to redirect to some motivational web page, you can certainly do so. Open Chrome Nanny’s options page. In the “General Options” tab,  select “Redirect” as the value for “Mode of Blocking”. Enter the redirect url. Note that you cannot redirect to a URL that is blocked.

8. Chrome Nanny did not block my page

There are multiple possible reasons for this scenario.

Case 1: Check if the settings are correct. Is Chrome Nanny disabled ? Are you in Incognito mode ? Obvious, but it does not hurt to say again. Should this URL should be blocked now ? You can click on Chrome Nanny’s popup icon to get more details on which URLs are blocked now.

Case 2 : Is the blocked URL a substring of the tab’s current URL ? For eg having facebook.com will block http://www.facebook.com/home.php , http://www.facebook.com/settings.php and so on. For some websites, the URL with which we access may not be the final URL.  Eg reader.google.com may not work. Enter blocked url as google.com/reader. Enter mail.google.com instead of gmail.com and login.live.com instead of hotmail.com and so on.

Case 3 : Check if blocked list and white list URLs clash.

White listed URLs take precedence and if a URL matches white list and block list then it is allowed. A sample scenario is to block Google reader but allow all other google pages. To do this entering google.com/reader in blocked list is enough. If you add google.com in white list , then Google Reader is also allowed as it matches the white listed URL “google.com” .

Case 4 : Check if any of your blocked or white listed URLs using regular expressions (eg using “*” in the URL). If so, validate it in “Validate Regular Expressions” tab. Note that an error in any of the regexp URLs can cause Chrome Nanny to not block other URLs.

Case 5 : Click on Chrome Nanny’s popup icon (the one that looks like a clock). Check if the URL is blocked now. If it is , then Chrome Nanny will block the URL sooner or later. Chrome Nanny uses callback functions of Chrome’s events to perform the blocking. If they are not called , Chrome Nanny might not block the tab immediately .

Don’t worry : Chrome Nanny has other checks too ! It checks all the tabs every minute and blocks tabs if necessary. Also if you switch to another tab or refresh the tab , the tab is checked again. So if Chrome Nanny does not block it immediately then give it some time. If the tab is not blocked even after one minute (Although, Chrome Nanny’s popup says otherwise) then please check the troubleshooting section to see how to contact the developer about the error.

9. Chrome Nanny blocked my page before the deadline is up !
Chrome Nanny has a feature which allows you to specify total time you can spend on all blocked URLs in a day. Suppose you set it to 60 minutes. Then if the total time you have spent on all blocked URLs exceed 60 minutes, then all blocked URLs will be blocked immediately, even though individual URLs may have some more time left. ie This feature overrides the individual URL settings. To disable this feature , set Maximum Allowed minutes in a day for Blocked URLs to 0 in General Options tab.

10. Can I block a subdomain or a specific url ?

Sure. For eg, if you want to block Google Reader alone (but not other google pages) enter google.com/reader in the blocked list. This will allow all Google pages but will block Google Reader.

11. Can I block certain patterns of URLs ?
A sample scenario is this : I want to block all Google searches for games but other queries are ok. Yes, you can do it by having a blocked URL as “google.com/search.*games” .

12. Some examples for regular expressions

Please note that you need to use “.*” whenever you want to use “*” in the regular expression. (Eg .*.wordpress.com instead of *.wordpress.com )

a) google.*
Matches google.com , google.co.in, google.com/reader , picasaweb.google.com
Does not match any URL that does not have the word google in it.

b) http://www.google.*/reader
Note : Chrome Nanny internally strips http,https and www. So this regexp is equivalent to google.*/reader
Matches http://www.google.com/reader/view
Does not match google.com, google.co.in, picasaweb.google.com, reader.google.com

c) *.wordpress.com
Does not match anything. Worse yet, it can prevent validtion of other blocked URLs. If you verify this URL , you get an error “Invalid regular expression: /*.wordpress.com/: Nothing to repeat”. This is because , the “*” operation needs some character to repeat and when you dont give any, it errors out.

d) .*.wordpress.com
Correct way to block all wordpress.com blogs. Here the “.*” matches any characters that come before the domain and hence it will block all of them. If you want to allow say, “saravananthirumuruganathan.wordpress.com” but block other wordpress blogs, then create a “.*wordpress.com” blocked URL and make “saravananthirumuruganathan.wordpress.com” as a whitelisted URL.

e) test

This will match any URL that contains the word test. For eg test.com, blahtest.com, foo.com/test , bar.com/g.php?val=test etc.

13. I do not want the Challenge that occurs when I try to edit/delete a blockset when it is blocked !
The 64 character (default) challenge that Chrome Nanny raises when you try to edit/delete a blockset when it is currently blocked is one of the few hurdles in your way before you start whiling away your time ! I do understand there are many “legal” scenarios like experimenting with Chrome Nanny when challenge is an annoyance. So use the following feature only when needed. Go to General Options and then Length Of Challenge Text . Reduce the length 0. To prevent abuse, Chrome Nanny will ask for challenge once. If the length is changed to 0, then further changes do result in a challenge. Once you are done with the playing around, please do increase the challenge text length.

14. I do not want the blocked URLs to be displayed in the popup !
By default, Chrome Nanny will show the URLs currently blocked, how much time left in other blocked URLs and other details. If you do not want it to be displayed in the icon popup, go to Options , click ‘General Options’ tab, and select ‘No’ for the field ‘Show blocked URLs in popup ?’ . After this, when you click on the Chrome Nanny icon, it will display a bland message instead of the blocked URL details.

15. I think I have found a new bug ! Or How do I troubleshoot Chrome Nanny ?

I have tested Chrome Nanny extensively but bugs do creep up. Please check if you can reproduce the error consistently. If so, please point out the bug and the steps to reproduce in any of the following ways : comment at Chrome Nanny’s extension page OR comment in Chrome Nanny’s instructions blog post OR email the developer at saravanan DOT thirumuruganathan AT gmail DOT com .

It would be great if you can email the settings of Chrome Nanny also. Easiest way is to email the file chrome-extension_gpdgmmdbbbchchonpfanphofpplhmcmn_0.localstorage at ~/.config/google-chrome/Default/Local Storage (If using Linux and Chrome) or ~/.config/google-chrome/Default/Local Storage (using Linux and Chromium) or at C:\Users\\AppData\Local\Google\Chrome\User Data\Default\Local Storage (In Windows) .

Optionally you can also give me the logs when the bug occurs. To get Chrome Nanny’s logs , click on the Wrench icon – Select Extensions. Go to Chrome Nanny and click on “background.html” . This will open Chrome’s developer tools. Now try reproducing the bug and copy the log it generates. This will be very helpful for additional debugging.

16. I have a patch for feature X . How do I send it to you ?

It is wonderful that you took time to write a patch. Please send an email to saravananDOTthirumuruganathanATgmailDOTcom with the patch details and the file. I will test it and apply it to the extension. The latest code of Chrome Nanny will can be downloaded from the repository here . If you need additional help on the code please take a look at my post “How to Read the Source Code of Chrome and Firefox Extensions” .


First of all, Thanks for using Chrome Nanny !

Chrome Nanny is a Chrome extension which can keep your browsing habits in check. Do you spend more time on facebook than on work ? Do you spend time more time in Google Reader or Digg and later wish you had not spent as much time ? Do you want to know how much you spent on Flick ? If so , Chrome Nanny is for you. Using Chrome Nanny, you can limit yourself from going to some sites on pre determined times or limit the time you spend on some sites. If you do not want to block a site, but want to know how much time you spend there, Chrome Nanny can do that for you too ! If you have used Leech Block for Firefox , you can recognize that Chrome Nanny does something similar but with a twist.

Note : If you are in Google Chrome version 5 or more , then enable this extension to run in Incognito mode too! Chrome Nanny will not like it if you visit blocked sites in Incognito mode. Will she ?

General Options

Mode Of Blocking decides what to do if you are visiting a website during blocked hours or after exhausting all the time you allocated yourself for the site. The default option is to remove the tab which may not be ideal for you. If you want the tab to be redirected to some motivational sites then you can select the redirect option and give a redirect url. You can specify a web page or a local html page (using file:// prefix) . Note that if you have only one tab, mode of block is”remove” and the url is blocked now, the entire window will be closed.

Stop Timer after Chrome is inactive for x minutes – Chrome does not notify when you minimize a Window/Tab. Chrome Nanny does not want you to lose the minutes you were not at the desk. You can enter some number in this field. For eg, if you are not active for 5 minutes, then Chrome Nanny will stop tracking the minutes till you come back.

Maximum Allowed minutes in a day for Blocked URLs – Use this field if you want to set a single limit to the time you spend on Blocked URLs. This value will override the individual Blocked URL limits. As an example , lets say you added facebook.com to Blocked URL list and set Max Time In a day as 60 minutes. If you now set, Maximum Allowed minutes in a day for Blocked URLs as 30 minutes, then facebook.com will not be accessible after 30 minutes . The same holds when you have multiple Blocked URLs. If the sum of time spent on all the URLs exceed this field, then all Blocked URLs will be blocked.

Length Of Challenge Text  – This determines the length of the Challenge text that Chrome Nanny will ask if you  try to edit/delete a blockset when it is  currently blocked. Reducing this field will also decrease the length of the challenge text. This field was added because in “some” scenarios (eg when playing with Chrome Nanny) , Challenges are an annoyance. Please use this field with discretion. To make changing this field a little hard to use, when you reduce the length of the Challenge, Chrome Nanny will perform a Challenge. So if you try to reduce a 64 character challenge  to 32 character, you will be challenged with a 64 character random string before being allowed to change it. Making the length as 0, removes all challenges.


Tags are a way to aggregate individual URL statistics. For eg you may spend lot of time on nytimes.com and Google news. If you want to aggregate the results into a “news” tag, then you can use the Tags tab for it. An url can belong to multiple tags.

Blocked URLs

Do you think, you spend too much time on Facebook ? This is the tab where you can use to limit your visits.

Block Set Name : Chrome Nanny allows you to group multiple URLs into a block set. Enter a name that you think summarizes the list of URLs. Eg News, Social Networks, Blogs etc.

URLs : Add the websites in this block set here. You need not add a full site url. So facebook.com will be enough. No need to add the whole “http://www.facebook.com”. Note that the url must be the “final” URL of the page that you want to be blocked. This means that gmail.com is better written as mail.google.com , reader.google.com is better written as google.com/reader and so on. You can add as many URLs you want in the text area. Separate them by newline (Enter key). ie a.com enter b.com blocks both a.com and b.com.

Add Tag : If you add any tags in the Tags tab, then you will see those tags here. You can add any number of tags for the url here. Just select the tag and keep clicking “Add Tag”. A URL can have multiple tags.

Block Time : This is the most important information. This decides when the url should be blocked. So if you want it to be blocked from 9 AM to 5 PM, then you encode it as 0900-1700. This is nothing but expressing start and end time as hhmm-hhmm in the 24 hour format. You can add multiple time blocks by separating them by comma. So to block between 9AM-5PM and 7PM-9PM, you write 0900-1700,1900-2100. Note that during the time a URL is blocked, you will not be able to edit or delete the URL.

Max Time : This an optional field. If you want to limit the time you spend on a site during your allowed time, then this field is useful. For eg, taking the example above, if you want to block between 9AM-5PM but you want to limit your browsing to 1 hour in the allowed time (12 AM-8:59 AM , 5:01 PM-11:59 PM) then you enter 0900-1700 in Block Time and 60 in the Max Time In A Day.
Apply On Days : Chrome Nanny understands that you may want to relax on weekends. So if you want your strict rules to apply only on weekdays, uncheck the weekends here.

This field also allows you to specify the block time in a granular level. For eg, you can set yourself to be allowed to browse the site for a maximum of 10 minutes each hour. To do that, set max time as 10 and in the drop down select for every “1 hour’”.

Note that you can edit or delete all the URLs any time when it is not blocked.

Lock Down

Lock down tab allows you to go into a focus mode by blocking some web pages for next “n” minutes. To do that, select the list of blocksets and then set the time to lock down. Note that once a lock down is active, you cannot edit or delete the blockset. Additionally, there is no way to cancel a lockdown too.

The lockdown information is visible in popup and also in the ‘Lockdown Information’ block.

White Listed URLs

If you do not want to block a URL but want to find how much time you spend each day, then use the White Listed URLs tab. Any URL added here is not blocked, but will be tracked and can be charted.
URL : Enter the URL of the site you want to be tracked. Again, you can enter just the domain name to track any page in the site.
Add Tag : As with Blocked URLs , you can add tags to White Listed URLs too !


If you want to visualize how you spent your days with respect to the URLs you entered in Chrome Nanny, then this is the tab for you. You can enter the date range and Chrome Nanny will give you four charts. One each for Blocked URLs, Block Sets, White Listed URLs and tags. You can select between Bar Chart and Pie Chart !.

Validate Regular Expression

If you are going to use a regular expression in the URL, then you can use this tab to validate it. A bad regexp can cause syntax error in the code and *might* cause Chrome Nanny not to block other URLs.

Validating a Regular Expression : Enter your regexp in “Regular Expression for URL” and click “Test Regular Expression”. Check the field “RegExp Error”. If there is any error in regexp, it will be displayed here.
Verify if an URL is blocked : Enter the regexp in “Regular Expression for URL” . Enter URL to be tested in “Test URL”. Click “Test Regular Expression”. Check the fields “RegExp Error” and “Match”.

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