LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.
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ImTranslator provides translation powered by Google Translate, Microsoft, Babylon for 70+ languages. It includes Translator, Dictionary, Text-to-Speech, Back Translation.
Video Tutorial: http://youtu.be/qyLyFkQuMGU
Use the Evernote Web Clipper to save things you see on the web into your Evernote account.
Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!
StumbleUpon is the easiest way to discover new and interesting photos, videos, web pages and more, recommended by a community of experts. Tell us what you are interested in and we recommend page after page of amazing stuff you’d never expect to see.
Automatically find user scripts on Userscripts.org (requires Greasemonkey or Scriptish)
Signatures for Gmail, Google Mail, Yahoo Mail
An extension that allows for the use of dynamic commands in Firefox.
The about:me page provides a fun way to see personalized patterns and trends in browsing history.