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Tab Counter
A simple extension that counts the number of open tabs per window and displays the count in the toolbar...
Colorific
Colorize entire web pages. Configure themes using sliders and drag-and-drop. Set domain preferences for automatic coloration.
Extension Auto-Installer
Important note: This extension will not work in Firefox 57 and above. Providing this functionality in Firefox is no longer possible, the extension is discontinued.
Window Master
Functionality for multiple screens and windows. Easily open links in other windows or on other screens, move or merge tabs, and move or merge entire windows. With graphical controls for grid positioning.
Column Reader
Web reader for wide screens and long documents. Read with pleasure in attractive layouts.
Restartless Restart
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
Re-Pagination
See more search results etc. on one page, concatenating several pages together...
mozCleaner
Cleans your Firefox, Thunderbird, SeaMonkey, Fennec (unstable), Instantbird and BlueGriffon.
Android Debug Bridge For Firefox
This addon adds some Android Debug Bridge access to Firefox. It requires access to the adb/adb.exe executable from the Android SDK.
Stop Tube HTML5
Stops autoplay of YouTube HTML5 videos (WebM). It is Flash-Block equivalent for HTML5 videos.
To create your own collections, you must have a Mozilla Add-ons account.