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.   Prevent the tooltip from hiding automatically
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Supplement based on the public interface of translate.google.com / 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.   These sentences are made by the automatic translation
  Special thanks to White Alice0775 for he
The current version of one-way transfer: from any language to Russian.   The Firefox add-on coupon from coupon circus keeps an eye out for you
  WINDOWS VISTA (Note: This Extension doe
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.   Groowe plugins can be downloaded for many other sites like YouTUBE, IMDb, Technorati, Exalead, Clusty, Torrent sites, dictionaries, etc
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Web-page supplement: www.s3blog.org/s3gt.html   Due to this often-recurring bug:
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New in version 1.14:   Optionally save history of items sent to
  Note: the status bar has been removed in