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WebMyStyles
Style the web your way- provides a GUI that allow web users to change the look-and-feel of arbitrary web pages to something more pleasant and accessible.
Splash! (Compatibility Update) Requires Restart
Adds a splash screen. Supported in Firefox, Flock, Thunderbird, Sunbird, eMusic Remote, Songbird and Sunbird.
lolifox - Fierr MOD Requires Restart
Replaces the error page with a lolifox appearance with additional features.
Personasizer
Personasizer allows you to expose more of your persona's header image. Useful for personas that have text or an important part of their content cut off by the browser's navigation elements.
Personas Windows Classic Statusbar Requires Restart
“Personas” add-on installed, but bottom status bar still gray? This add-on modifies style so Personas footer can show. For desktop's gray “Windows Classic” theme (only Windows 2000 theme) with “Default” app theme. Requires Personas add-on ≤1.5.*.
ClassicFox Requires Restart
ClassicFox fixes problems with the appearance of the default theme in Windows Classic.
Splash! (Compatible version of Firefox 4) Requires Restart
Adds a splash screen. Supported in Firefox, Flock, Thunderbird, Sunbird, eMusic Remote, Songbird and Sunbird.
Active Stop Button Requires Restart
Stop gif animation with button, context menu or Esc key
Edit Bookmark Plus Requires Restart
Resize 'Add Bookmark' Popup / 'Edit This Bookmark' Popup, fixes tree selection bug, option to disable popup auto close & Update Url and/or Name of a bookmark with the Url/Title of current page.
Replacement of OpenBook addon
HD Video Downloader
Download every YouTube video you want and you can download them as Full HD MP4, FLV, 3GP, MP3, M4A and AAC formats.
NiceReader Requires Restart
NiceReader is designed for web reading. You can customize font, color, size, background, specify the elements to read, filiter ad elements, filiter ad strings, automaticaly turn page.
CheckBoxMate Lefedor Edition Requires Restart
Check multiple checkboxes by drawing a rectangle around them. FF6 version.
I've made this version since i did need it for use with RTM,
Xclear Requires Restart
Safari-like icons in the URL, search and find fields to clear their contents.
PageTweak - Ad Blocker, Video Downloader, Translator...
The Ultimate Webpage Enhancer! Instantly add many tweaks to any webpage including: Ad block, flash block, video download, remove delays, tooltip translation, link checker, rounded corners, auto pagerize, and more. A must have for all web users.
To create your own collections, you must have a Mozilla Add-ons account.