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Y U no validate Requires Restart
In the "Add Security Exception" dialog makes "Permanently store this exception" checkbox unchecked by default.
Previously known as XULernia. New name seems to be less misleading.
Yahoo! Mail Notifier Requires Restart
This extension notifies you when new messages arrive in your Yahoo mailbox.
Yoolki Arabic Keyboard Requires Restart
Write arabic text "bil 3arabi" on any web page without the need for an Arabic Keyboard.
YouTube Anywhere Player
Watch videos anywhere in cinema mode without leaving the website you're on.
YouTube Downloader and Converter Requires Restart
Easy to Download YouTube Videos in FLV and MP4 and Convert to MP3,AVI etc.
Youtube Downloader Gold
This extension to download audio and video from popular video hosting YouTube. To download the available formats mp4, webm, mp4a, mp3.
Youtube MP3 Podcaster Requires Restart
Self contained add-on for downloading youtube videos to mp3 for easy listening on podcasting gadgets like a Zune or iPod
YouTube Video Player Pop Out
YouTube Video Player Pop Out lets you pop out YouTube videos so that you can watch YouTube videos while you surf.
YouTube Videos Download in one click Requires Restart
Download YouTube videos by clicking a button underneath videos in YouTube. Save YouTube videos and songs in 1080p (HD) MP4 or FLV format.
Ziftr Alerts (formerly FreePriceAlerts)
You do the shopping. We'll do the searching. It's that simple.
Zindus Requires Restart
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
Zing! Locale Switcher
Want to change from one language to another? Zing! and the locale is switched.
ZoneMinder Client Requires Restart
ZoneMinder Client is a Firefox Extension that provides toolbar buttons and other features to help you when connecting to your ZoneMinder Server.
Zorcher Requires Restart
Selecting a small text on the page do not need to copy it into the search bar of your browser or search engine. Just press the right mouse button and select the search service from the available list.
To create your own collections, you must have a Mozilla Add-ons account.