Scriptish Requires Restart
The greatest user script engine on the Internet (a fork of Greasemonkey).
Linkification Requires Restart
Converts text links into genuine, clickable links...
Password Tags Requires Restart
Adds metadata and sortable tags to the password manager.
Custom Buttons Requires Restart
Gives a possibility to create custom toolbarbuttons...
Firesizer Requires Restart
Allows you to resize the window to specific dimensions.
NOTE: Users of Firefox 29 and above must install "The Addon Bar" extension to use this, as Firesizer uses the add-on bar that has been removed in Firefox 29.
This extension provides various customization options for the Adblock Plus user interface.
Sync engine for Stylish with backup / restore facility.
IMAP Received Date Requires Restart
Make the “Received” column in IMAP folders show when messages were actually received.
The Add-ons Manager slims down!
This add-on reduces the height of entries in the Add-on Manager, so you can display more of them at a time.
FLST (Firefox 4+) Requires Restart
Provides Focus Last Selected Tab and Tab flipping functionality (based on the FLST extensions by Gorgias and Gozer, but ported to Firefox 4/.../56 and repaired Tab flipping functionality). Enjoy!
HTitle (discontinued) Requires Restart
Hide title bar if window is maximized.
This add-on has been discontinued!
Legacy extensions support will be dropped in Firefox 57. If you interest in CSD on Linux, please track progress on https://bugzilla.mozilla.org/show_bug.cgi?id=1283299.
Block advertisement and access to adult sites
Makes every page to have light text on dark background (exact colors are customizable)
Firefox version is here: https://addons.mozilla.org/firefox/addon/dark-background-light-text/
Switch tabs by scrolling with the mouse wheel in the tab bar.
ImageTweak: zoom/rotate images and videos! Requires Restart
A no-clutter image viewer for Firefox that allows you to zoom, rotate and display images/videos against a custom background. ImageTweak is a must-have addon for any photographer or photography-loving user.
Enhanced Priority Display Requires Restart
Enhanced thread pane display of message priorities.
Compact Menu 2 Requires Restart
Add a compact menu button to the navigation toolbar, and hide the menu bar.
Active Stop Button Requires Restart
Stop gif animation with button, context menu or Esc key
Strike the 'T' key to sort messages by thread, strike the 'U' key to sort them unthreaded again, just like the 'G' key switches to Grouped By Sort view
Tabs Menu Requires Restart
Adds a Tabs menu to the main menu that lets you easily change between tabs.