Be careful with old versions!
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v Added custom switch back key (default Q), currently about:config preference only: extensions.qls.switchback.key
v Bugfix: Switching back using CTRL + SHIFT + Q did not always work in Thunderbird 4+
v Tested for compatibility on Firefox 6 and SeaMonkey 2.2
v Bugfix: Prevented "Components is not defined" error.
v Tested on Firefox 5 beta
v Bugfix: After settings apply the displayed selected locale would switch back to the default
v Bugfix: Selected content and UI locale were no longer being highlighted in the menus
v Tested on SeaMonkey 2.1b1
v Firefox 4 - Populate the toolbar button's popup menu after customizing the toolbar
v Firefox 4 - Added css to support the new 18x18 toolbar image size
v Tested on Firefox 4b6
v Bugfix: Settings were not being applied directly, a restart was necessary, fixed the observer.
v Bugfix: The existence of a locale in the intl.accept_languages preference was checked case sensitive, made insensitive to avoid duplicates.
v Tested on Thunderbird 3.1.
v Added a ca-ES flag.
v Bugfix: The backup mechanism for the accept languages setting was broken.
v Tested on SeaMonkey 2.0.
v Implemented a pref observer for the accept_languages preference so that if a user manually changes it, the QLS backup pref for it can also be updated.
v Tested on Firefox 3.6b5 and Thunderbird 3.0 final.
v Bugfix: The statusbar tooltip in Thunderbird showed weird text.
v Added eo-EO, dsb-DE and hsb-DE translations.
v Tested on Firefox 3.5 final.
v Split up sr-SP into sr-RS (Serbian) and sr-ME (Montenegrin)
v Added nn-NO and sr-RS translations.
v Tested compatibility with Sunbird 0.9
v Bugfix, special gmail fix caused problems in Thunderbird (no gBrowser...)
v Added Sri Lankan Tamil (ta-LK) as one of the default locales.
v Added mk-MK translation.
v Bugfix: bug on babelzilla caused some translations to show empty dtd entities.
v Bugfix: Flags still did not always display correctly in Firefox 3
v Bugfix: Problem with the flag icons not displaying in Firefox 3
v Bugfix: After removing (unchecking) locales in the settings you had to restart Firefox before the toolbar/statusbar menus where updated.
v Bugfix: issue in the Hungarian (hu-HU) translation fixed.
v Bugfix: Made the statusbar icon + text persistent so you will no longer see the default icon just after startup.
v Tested on Firefox 3b5
v Bugfix the fix provided in 22.214.171.124 to work around Firefox bug 391120 broke updating again for some locales cause apparently the bug has silently been fixed. Removed the workaround.
version 1.6.5 (18-03-2008)
v Add option to automatically switch based on the top level domain (website/e-mail address).
v Separate colors for UI/content language settings so you can see which setting is set on which locale.
v Combine the settings for spell checker and accept languages into 1 content language setting.
v Added option to reload the current page after you switched the accept languages header.
v Restore session after restarting.
v Fixed some spellchecking issues with gmail.
v Added is-IS translation.
v Bugfix: Fixed memory leak.
v Made compatible with Firefox 3b4
v Backup/Restore the http accept languages list when switching so it will not mess up the original configuration.
v Tested compatibility with Netscape 9.x.
v Tested compatibility with Sunbird 0.7.
v Tested compatibility with Flock 1.0.
v Added ar, ml-IN and wa-BE translations.
v Bugfix: After each switch spell checker related context menu's got messed up, reset them after each switch.
v Bugfix: 126.96.36.199 contained 1 new line in the dtd which I forgot, so it was missing in all other locales.
v The search feature to find a locale in the settings window now filters the list of locale instead of only highlighting one.
v Bugfix: Update manager can not find any updates if there is no update available for the current locale you switched to, workaround implemented so that the update manager checks using your default locale, bug logged to Mozilla Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=391120
v Bugfix/Feature: Only the first e-mail address was remembered for auto switching in Thunderbird, now all of them are remembered individually.
v Made compatible with Sunbird 0.5
v Bugfix: Error in Sunbird when the QLS tried to detect a content language for autoswitching (which is not supported/useful in Sunbird)