How to add translate feature to Firefox
By default, Firefox does not come with translation features, however you can easily add this feature by installing an add-on of your choice. Below we list several widely-used add-ons.
Google Translator for Firefox
The most used translator add-on for Firefox is Google Translator for Firefox by nobzol. It allows to translate full pages as well as selected text only by a single click or a shortcut. The translation will seamlessly replace the original text in the page.
S3.Translator by Oleksandr adds automatic Google Translate into Firefox. It supports to translate whole webpages, selected text or entered phrases between 100+ languages. It also offers a feature for helping you learn new languages.
This add-on by Andy Portmen is a multi-language translator, which adds a Google Translate button in your browser toolbar, which opens simple translate UI. It also allows to translate whole pages from the context menu.
If none of the add-ons fits your needs, there are many more you can try in the language category on our Firefox Add-ons server. If you are looking for other language support than translators, please check out the following articles.