Add-on for Firefox and Thunderbird. Replaces built-in notifications with the OS native notifications. It supports most Linux Desktop Environments, Windows 8.1 & 10.
Manage your installed personas (lightweight themes).
YouTube Video Player Pop Out lets you pop out YouTube videos so that you can watch YouTube videos while you surf.
Open With Google Chrome sends pages from Mozilla Firefox to Google Chrome.
Switch tabs by scrolling with the mouse wheel in the tab bar.
Pretty-prints JSON content in the browser for easy, unobtrusive viewing.
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.
Adds icons to buttons and/or menus.
Restores the default image style used for top-level images in previous versions of Firefox.
See more search results etc. on one page, concatenating several pages together...
Duplicate This Tab Requires Restart
This add-on provides the much needed feature update of Tab Duplication to Mozilla Browsers. Features Supported include Duplication of Browser Tabs, Detaching Tabs and Merging All Windows.
Compact Menu 2 Requires Restart
Add a compact menu button to the navigation toolbar, and hide the menu bar.
Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks
Sync engine for Stylish with backup / restore facility.
Open With Internet Explorer sends pages from Mozilla Firefox to Internet Explorer.
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.
FolderFlags Requires Restart
Allows users to edit the flags Thunderbird sets on folders.
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.
This extension enables true full screen mode in SeaMonkey for HTML5 video players, slide-shows, etc. and also for full screen invoked manually with the F11 key.