Copy Plain Text 2 - a nice extension
How to install bytubed
YouTube Anywhere Player - a must have extension !

S3.Google Translator

S3.Google Translator S3.Google translator translates the selected text, the introduction of any phrases or all web-site from any language to Russian

Detailded description:

S3.Google Translator is an addition to browser Firefox, which will make your visit will not Russian sites.   This jetpack watches any Twitter tabs and annotates the favicon with the number of unread tweets.
  If a voucher will be available at the to
Supplement based on the public interface of / and therefore has at its disposal more than 50 languages, from which you can make the translation into Russian. Also enables auto-detection and the original language.   So come on and let your friends see what are you exciting about
  Thank you kwierso for the Jetpack addon
The current version of one-way transfer: from any language to Russian.   Also allows you to enable an Auto-Hide mode if you wish to use that
  IdentFavIcon is based on the idea of Don
Firefox add-ons in the pantry has many unique, simple and complex, but they all have one annoying feature: the translation of the selected text text formatting is lost. We S3.Google deprived of this trouble, and I hope you will be very useful.   Such as, relative tabs, highlight unread tabs, etc
  Chose from lots of Word Search Puzzles O
Web-page supplement:   This is for the all time people on orkut w
  Stay up to date with the latest precious
  You can also get the app for Chrome brow
New in version 1.14:   In additional, "Permissions" b
  An image file on your computer can also