Copy Plain Text 2 - a nice extension
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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.   FAQ & Contact form:
  Real time condition update + 5-day forec
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.   modify, when the load of the new feed init instead bind once every 2.5 seconds,
  "Silent" This is like the old
The current version of one-way transfer: from any language to Russian.   In Firefox 1.0 and 1.5 the backspace key was used to go back to t
  Clues propagate instantly throughout the
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.   IETAB 2 NOT WORKING WITH LATEST FIREFOX 9
  Once installed, this simple extension wi
Web-page supplement:   To switch display Chinese webpage between
  Then will show you alle occu
  After you've typed your message, select
New in version 1.14:   The icon is automatically updated every
  Using Etacts, you can see lots of inform