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Mozilla Firefox Addons 
This jetpack allows you to quickly translate text with Google Translate.
With Gesture Translate you can translate any text in a webpage just by full circle or zig and zag mouse movements. The translated text will be showed in the status bar
Translate using Google translate service for any language to Persian & any language to English
Translate current page by using Google Translate. Only one click. Easily switch between translation and original page.
(former Google Dictionary and Google Translate)
In-line dictionary for any word you point to or double-click; whole page translation of any web page in another language.
Translate words with Google by selecting them. Get a pop up translation. Can be set for user's own language by choosing the Google website for that country.
With gtranslate you can translate any text in a web page just by selecting and right-clicking over it. The extension uses the Google translation services to translate the text.
QGTranslate is very helpful if you want to translate shorts texts from the websites or even the full webpage within 1-2 clicks without opening a new tab and without leaving the trust area of Google Translate.
Translate entire web page or selected text using google translate
There are many translators on Firefox. There are two features they're not supported:
1.HTTPS pages
2.Page logined
This addon can translate all pages you can open in firefox
Google translate gadget for firefox. This extension translates entire webpages into a language of your choice with one click. Idea comes from Google Translation Bar for Chrome.
