Ein Leben ohne Mops ist möglich, aber sinnlos. Firefox ohne diese Add-ons ist denkbar, aber traurig.
Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
United States English Spellchecker for Firefox, Thunderbird and SeaMonkey by Kevin Atkinson and Geoff Kuenning.
To enable, right-click in a multi-line text box, select "Languages", then "English (United States)".
German Dictionary (new Orthography) for spellchecking in Mozilla products
When you find something on the web that you want to view later, put it in Pocket. It automatically syncs to your phone, tablet or computer so you can view it at any time, even without an internet connection.
IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...
Note from Mozilla: This add-on has been discontinued. Try Add-on Update Checker instead.
Notifies you when updates are available for your extensions and themes.
An extension to hide the caption of Firefox, displays Minimize, Maximize/Restore and Close buttons on the menubar/nav-bar, and includes "Tiny Menu" function. This extension also provides "Bookmarks" and "Histroys" buttons with popup menu.