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.

Add Google Translator for Firefox to Firefox

S3.Translator

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.

Add S3.Translator to Firefox

Google™ Translator

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.

Add Google™ Translator to Firefox

More

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.

• How do I use the Firefox spell checker?
• Use the Firefox interface in other languages with language packs