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.
Download every YouTube video you want and you can download them as Full HD MP4, FLV, 3GP, MP3, M4A and AAC formats.
Restores the default image style used for top-level images in previous versions of Firefox.
TrayHotKey Requires Restart
In the DOM Inspector,quickly navigate to the any elements
Transform the colors of entire web pages or selected elements. Combine predefined themes with basic transforms. Save transforms for specific web domains.
Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.
Scriptish Requires Restart
The greatest user script engine on the Internet (a fork of Greasemonkey).
Keeps track of your browser tab number.
Fast Close Tabs Requires Restart
Closing the window closes the active tab instead of the window.
Right Links Requires Restart
This extension allows to open links in new tabs with right-click directly and using “long” left-click.
This is very useful for touchpads on notebooks and for mice without middle button.
[Restartless] [e10s Compatible]
Easily viewable version info in the Add-ons Manager on Firefox/Thunderbird 41.0 - 56.*
Also restores the add-on version number on Firefox/Thunderbird 41.0 - 56.*.
KeePass Helper Requires Restart
Adds a hostname, URL, or email account ID to the application's window name (e.g., that of Firefox or Thunderbird) to make it recognizable to password manager utilities like KeePass.
Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.
Classicish Add-on Manager Requires Restart
A restyling of the Add-on Manager to a more native appearance.
Linkification Requires Restart
Converts text links into genuine, clickable links...
Active Stop Button Requires Restart
Stop gif animation with button, context menu or Esc key
printplus Requires Restart
PDF export support by Gecko.
Colorize entire web pages. Configure themes using sliders and drag-and-drop. Set domain preferences for automatic coloration.
Flexible Sidebar allows to change sidebar width by dragging the handles.