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What is LeechBlock?

LeechBlock is a simple productivity tool: an extension for the Firefox web browser designed to block those time-wasting sites that can suck the life out of your working day. (You know: the ones that rhyme with "Blue Cube", "Space Hook", "Sticky Media", "Quitter", and the like.) All you need to do is specify which sites to block and when to block them.

You can specify up to six sets of sites to block, with different times and days for each set. You can block sites within fixed time periods (e.g., between 9am and 5pm), after a time limit (e.g., 10 minutes in every hour), or with a combination of time periods and time limit (e.g., 10 minutes in every hour between 9am and 5pm). With the lockdown feature, you can block sites immediately for a specified duration. You can also set a password or random access code for LeechBlock's options, just to slow you down in moments of weakness!

The sites to block can be specified using wildcards (e.g., *.somesite.com) and exceptions (e.g., +allowme.somesite.com).

LeechBlock also keeps track of the total amount of time you have spent browsing the sites in each block set.

LeechBlock was inspired by Gina Trapani's Invisibility Cloak user script for the Greasemonkey extension.

LeechBlock Options

LeechBlock Lockdown

How do I get started with LeechBlock?

  1. Install the Firefox web browser (if you haven't already done so).
  2. Install the LeechBlock extension from one of these sites: (Note: You may have to restart Firefox after installation.)
  3. Select LeechBlock > Options... from Firefox's Tools menu (or the right-click context menu) to specify which sites to block and when.
  4. (Optional) Add the LeechBlock button and/or countdown timer to one of Firefox's toolbars.

That's it! You're good to go.

Visit the examples page for some examples to illustrate the different settings or visit the FAQ page for answers to some frequently asked questions. Note that there's also a community support forum.

If you find LeechBlock helpful, please consider supporting its continued development by making a contribution or writing a review.

Is there anything important I need to know about using LeechBlock?

Important note #1: LeechBlock is not designed for parental control or for blocking offensive content. You are advised not to try to use it for these purposes.

Important note #2: Although LeechBlock prevents you from browsing sites (at the specified times) it may still allow your Firefox browser to briefly connect to those sites (so that, e.g., your IP address may still be logged by the blocked site). If you want to prevent any such connection, you should use some lower-level blocking method (e.g., install and configure a HOSTS file manager like HostsMan).

The password feature isn't intended for security purposes, only to make it more difficult to bypass the blocking in haste — to delay you just long enough for your reason/conscience to wrest back control from your baser instincts! So a lengthy but memorable password will be most effective. Alternatively, try one of the random access code options.

Note that by default the time spent on a site is calculated by summing the time that pages from the site have focus in the browser, rather than the time that those pages are loaded in the browser. (You can change this default behaviour via the options.)

Where can I get help with using LeechBlock?

You can direct queries and feedback to [enable JavaScript for address] (but please review the examples page and the FAQ page before asking questions). Note that there is also a community support forum.

What are people saying about LeechBlock?

Here are some reviews and tutorials for LeechBlock: