Best translator addon for Firefox, older and newer to choose from
Firefox addons that will let you translate a complete page or selected text are numerous, and I have not tried everything. I have tried a lot of them, the most popular, but also some less popular.
I found addons that were not able even to detect the language of a page, in order to translate it! However, I won’t present here all the addons that I tried, only the best.
S3.Google Translator is a free adddon that supports translation of selected text, entered phrase or whole webpage between any of 80+ languages, whatever Google covers. Note that this addon works only with older versions of Firefox.
Google Translator for Firefox is another nice translator, that works only with the newer versions of Firefox. Here are download links for both addons to get what you need.