With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.
To Google Translate Compatibile con Firefox 57+ Consigliati
Right-click on a section of text and click on Translate icon next to it to translate or listen it to your language.
Translator, dictionary and text-to-speech for 103 languages. Select and translate on any page with a shortcut on double-click.
Google™ Translator Lite Compatibile con Firefox 57+ Consigliati
a powerful tool to translate words or sentences
"Dictionary (Google™ Translate) Anywhere" extension provides access to a floating multilingual Google Translate panel on any webpage.