A very lite YouTube Downloader (FLV, WebM, 3GP, and MP4)
Quickly toggle between blocking all pop-up windows and allowing some pop-ups
LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.
Never be annoyed by a Flash animation again! Blocks Flash so it won't get in your way, but if you want to see it, just click on...
A customizable mouse gestures extension which enables to execute various commands and user scripts with six types of gestures.
FireShot Webpage Screenshots captures webpage screenshot entirely (see demo: http://bit.ly/RlBQMV)
The screenshot can be quickly annotated and:
+ Saved as PDF/PNG/GIF/JPEG/BMP
+ Sent to clipboard
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.
Take control of YouTube!
Download videos, convert videos to MP3 and AAC, block ads, automatically play videos in HD, watch the Top 50 and your favorite videos in sidebar while you surf, change YouTube's style, loop videos, etc..
Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
Evernote Clearly makes blog posts, articles and webpages clean and easy to read. Save them to Evernote to read anywhere.
AddThis for Firefox is the best add-on to make sharing and bookmarking simple. Have all your favorite web 2.0 social networking, bookmarking, blogging, and e-mail services at your fingertips. Share any page, anytime, with anyone.
NoSquint allows you to adjust the text-only and full-page (both text and images) zoom levels as well as color settings both globally (for all sites) and per site.