SmartTemplate4 Requires Restart
SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.
Sun Cult Requires Restart
Worldwide Sunrise, Sunset, Twilight, Moonrise and Moonset...
Remembers last selected (hilited) extension/theme/plugin/userstyle in Add-ons Manager. Version 3.0 also includes sorting buttons. Turn off/on the add-on selection list box and/or fine tune behavior via its Options.
bioFOX Requires Restart
Bioinformatics tools on Mozilla based browsers
Screengrab (fix version) Requires Restart
Screengrab! saves webpages as images.
New features: upload to internet
Select link's text just like a regular text (like in Opera'12 browser) - Select like a Boss ;)
Menu Wizard Requires Restart
Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey
Irvine ContextMenu Requires Restart
Downloads links and images with Irvine.
Youtube Video Center changes the new Youtube design and centers the whole Youtube page on the screen automatically.
Select link text with easy mouse gestures.
Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks
Twitter App brings Twitter right into your Firefox Sidebar.
Search in the address bar without changing your search engine.
rikaichan Requires Restart
Japanese to English/German/French/Russian dictionary. Just hover the mouse on top of a word, and a popup appears. Automatically de-inflects verbs and adjectives. Detailed kanji view...
PrefBar Requires Restart
Console² Requires Restart
QuickNote Requires Restart
A simple note-taking extension.
Form History Control Requires Restart
Manage form history entries (search, edit, cleanup, export/import) and easy text formfiller.
Auto-save text entered in any form while typing to allow fast recovery when disaster strikes.
Control for which webpage form history is saved or not.
Identity Chooser Requires Restart
Identity Chooser helps you to always use the correct identity when composing a new email.
MinimizeToTray For FF 3.5 Requires Restart
MinimizeToTray For firefox 3.Minimizes Mozilla windows into the system tray.Note:I am going to remove this extension if the original creator make a FF 3 version!