Version History

Version 1.0.7 (17 Mar 2017)

  • Fixed issue with semicolons in blocked URL.

Version 1.0.6 (21 Jan 2017)

  • Updated images and style (thanks to Dario Kolak).

Version 1.0.5 (07 Aug 2016)

  • Minor code improvements (per AMO reviewer recommendation).

Version 1.0.4 (26 Jun 2016)

  • Fixed minor GUI issue.
  • Fixed loophole in blocking about:addons, about:config, and about:support.

Version 1.0.3 (13 Feb 2016)

  • Added option to delay first/every page on site.
  • Added code to display date/time when page will be unblocked.
  • Updated localizations.

Version (16 Jan 2016)

  • Fixed issue with options dialog failing to open for some users.

Version (13 Jan 2016)

  • Fixed compatibility for Firefox ESR.

Version 1.0.2 (06 Jan 2016)

  • Fixed loophole with access password for options.
  • Updated URLs in options dialog.

Version 1.0.1 (18 Dec 2015)

  • Changed code to allow for custom blocking/delaying pages.
  • Added tab icon to blocking/delaying pages (thanks to Chris Crowley).
  • Added option to comment out entries in site list with # character.
  • Added keyword-based blocking (experimental feature).
  • Fixed bug in delaying block for sites with embedded pages (i.e., internal frames).
  • Fixed bug where time spent is over-counted when multiple pages are open.
  • Streamlined localization files (per AMO reviewer recommendation).
  • Rewrote code to avoid global namespace pollution (per AMO reviewer recommendation).
  • Various other improvements and fixes under the hood.

Version (17 Sep 2015)

  • Fixed issue with options dialog failing to open for some users.

Version (19 Jan 2015)

  • Fixed some issues with French HTML files.

Version 0.6.7 (26 Dec 2014)

  • Added French localization (thanks to ioreker).
  • Added code to block about:support along with about:config.
  • Fixed code to add current site to block set via menu.
  • Fixed issue with opening version history page after new version is installed.
  • Updated licence to MPL 2.0.

Version (27 Nov 2013)

  • Fixed minor issue with toolbar button orientation.

Version 0.6.6 (31 Aug 2013)

  • Added Taiwanese Chinese localization (thanks to Rex Tsai).

Version 0.6.5 (01 Jul 2013)

  • Added Czech localization (thanks to Michal Stanke).
  • Added Simplified Chinese localization (thanks to Wang.H.K).
  • Added option to block or allow all local files (use FILE or +FILE respectively).

Version 0.6.4 (27 May 2013)

  • Added Brazilian Portuguese localization (thanks to Gutierrez PS []).
  • Preferences now saved to file whenever options are changed (in case browser not closed properly later on).
  • Improved code to hide extension in Add-ons Manager (no longer appears under Search or Recent Updates).
  • Tweaked some of the English localization.

Version 0.6.3 (30 Apr 2012)

  • Added quarter-hour and half-hour options for time limit period.
  • Added support for Firefox Sync.
  • Reduced number of preferences (boolean prefs now stored in bit format).

Version 0.6.2 (04 Apr 2012)

  • Added support for Unicode characters in preferences.
  • Added option for 128-character access code.
  • Added “Support LeechBlock” links to options window and blocking pages.
  • Fixed bug in “Delaying Page” (countdown timer starting when new tab is opened in background).

Version 0.6.1 (09 Mar 2012)

  • Updated maxVersion to 11.*.
  • Added option to hide “Time Left” toolbar widget when inactive.
  • Fixed minor issues raised by AMO reviewer.

Version 0.6 (25 Feb 2012)

  • Updated maxVersion to 10.* and minVersion to 4.0 (i.e., no more support for 3.0).
  • Added “Delaying Page” (temporary block with countdown timer) as alternative to “Default Page”.
  • Added toolbar button/menu with same functionality as context menu.
  • Added toolbar widget to show time left before site is blocked (replaces status bar indicator).
  • Added option to hide extension in Add-ons Manager.
  • Added option to hide “Restart with Add-ons Disabled” menu item (in Help menu).
  • Changed “Add This Site to Block Set” menu items to show actual domain name.
  • Changed options to allow per-set canceling of lockdown.
  • URLs with hash-bang syntax now blocked correctly (e.g., Twitter pages).
  • Improved layout of options window.

Version 0.5.2 (12 Mar 2011)

  • Fixed issue retrieving options password when master password is set.
  • Fixed bug in retrieving preference for “Keep blocked page in browser’s ‘Back’ history”.
  • Fixed loophole in blocking about:addons and about:config.

Version 0.5.1 (08 Jan 2011)

  • Updated maxVersion to 4.0.* and minVersion to 3.0 (i.e., no more support for 2.0).
  • Added options to prevent access to about:addons (Firefox 4).
  • Added option for blocking embedded pages (e.g., Facebook internal frames).
  • Changed URL test to be case-insensitive.
  • List of sites now automatically sorted alphabetically.
  • Options password now stored in Firefox’s Login Manager (see Tools > Options > Security > Passwords).
  • Fixed issue with options not disabled during lockdown.
  • Fixed bug in calculation of time periods.

Version 0.5 (25 Mar 2010)

  • Added option to pass URL of blocked page in URL of block page (use $U).
  • Added option to keep blocked page in browser’s ‘Back’ history.
  • Added option to display warning message before site is blocked.
  • Added option to count time spent on pages when not focused (workaround for some sites with Flash/Java).
  • Added hyperlinks to examples (online) from options dialog.
  • Redesigned options dialog to use less screen real estate.
  • Removed localizations (translators unavailable).

Version 0.4.4 (22 Jan 2010)

  • Added Polish localization (thanks to Michał Otroszczenko).
  • Updated maxVersion to 3.6.*.

Version 0.4.3 (26 Jun 2009)

  • Added hyperlink to blocked page on default block page.
  • Added hyperlink to FAQ (online) from options dialog.
  • Removed Italian localization (translator no longer available).
  • Minor cosmetic interface changes.
  • Updated maxVersion to 3.5.*.

Version (29 Jul 2008)

  • Added preference to set height (in rows) of sites field in options dialog (and reduced default height).
  • Block page now replaces blocked page in browser history (so back button returns directly to page viewed before blocked page).

Version (15 Jul 2008)

  • Fixed issue with random access code (text could be copied and pasted in Firefox 3).

Version 0.4.2 (22 May 2008)

  • Added Brazilian Portuguese localization (thanks to Cláudio Bastos []).
  • Updated maxVersion to 3.0.*.

Version (16 May 2008)

  • Fixed confirmation when “Actively block …” and “All Day” selected.

Version 0.4.1 (08 Apr 2008)

  • Fixed bug in ‘lockdown’ feature.
  • Updated maxVersion to 3.0pre.

Version 0.4 (27 Mar 2008)

  • Added options to actively block pages when time period is entered or time limit expires.
  • Added option to show time left before site is blocked in status bar.
  • Added ‘lockdown’ feature (immediately block sites for a specified duration).
  • Added items in tools menu to context menu.
  • Updated maxVersion to 3.0b4 and fixed compatibility problems.
  • Updated minVersion to 2.0 (i.e., no more support for 1.5).
  • Released code under MPL/GPL/LGPL triple licence.

Version (23 Jan 2008)

  • Fixed localization of description and added translator credit.

Version 0.3.5 (09 Jan 2008)

  • Updated maxVersion to 3.0b2 and fixed compatibility problem.
  • Fixed problem with multiple home pages (now only the first one is used).

Version 0.3.4 (02 Nov 2007)

  • Added Italian localization (thanks to Andrea Diamante).
  • Potentially ambiguous characters (0, O, I, l) now omitted from random access codes.
  • Added more options for time periods.
  • Fixed method for counting time spent on pages in specified time periods (now time spent is only counted on selected days — and only within specified time periods when “within time periods AND after time limit” option is selected).
  • Added options to prevent access to about:config.

Version 0.3.3 (21 Sep 2007)

  • Added option to enter random access code for access to options.
  • Fixed loopholes in options to disable ‘Disable’ and ‘Uninstall’ buttons in Extension Manager.

Version 0.3.2 (07 Sep 2007)

  • Improved code to measure time spent on page.
  • URLs with file protocol are now checked as well.
  • Added support for super-wildcard (**) to match any character (including forward slash, unlike normal wildcard).
  • Fixed bug in options dialog.

Version 0.3.1 (15 Aug 2007)

  • Fixed formatting of times in statistics dialog.
  • URL of blocked page is now displayed on default block page.

Version 0.3 (10 Aug 2007)

  • Added time statistics dialog (shows time spent on sites for each block set).
  • Added option to block sites based on time limits as well as fixed time periods.
  • Improved option to prevent access to options at times when sites are blocked (now operates on a per-set basis).
  • Added prompt to confirm settings where access to options is prevented all day.
  • Added hyperlink to version history (online) from options dialog.
  • Changed predefined URLs for block page (closed window removed, home page added).
  • Added option to show/hide password characters when entered at prompt.
  • Added option to show/hide context menu.

Version 0.2.3 (25 Jul 2007)

  • Added option to prevent access to options at times when sites are blocked.

Version 0.2.2 (02 Jul 2007)

  • Added context menu items to add current site to block sets.
  • Added buttons to export/import options to a text file.
  • Fixed some problems with the ‘Load from URL’ option.

Version 0.2.1 (11 Jun 2007)

  • Sites are now blocked immediately rather than after the page loads (which can take several seconds).
  • Changed the format for time periods to be less strict (any sequence of commas and spaces allowed as separators).
  • Only URLs with http or https protocol are now checked.
  • Added hyperlink to home page from options dialog.

Version 0.2 (30 May 2007)

  • Added two more block sets.
  • Added option to load domain names from URL (useful for automatic update).
  • Added another predefined URL for block page (closed window).
  • Added option to set custom name for block set.
  • Added options to disable ‘Disable’ and ‘Uninstall’ buttons in Extension Manager (Firefox 2 only).

Version 0.1.3 (20 Apr 2007)

  • WWW prefix on domain names is now treated as implicit as well as optional (e.g., either or will block both sites).
  • Also made the pattern checking a bit more efficient and fixed a problem where the blocking wasn’t working for some users.

Version 0.1.2 (24 Feb 2007)

  • Added support for site exceptions (use + to prefix sites to allow, e.g., *.org will block all .org sites except and
  • Also added some convenience buttons to options dialog.

Version 0.1.1 (12 Feb 2007)

  • WWW prefix on domain names is now treated as optional (e.g., will also block

Version 0.1 (07 Feb 2007)

  • Initial version.