Chrome has a really neat feature that allows it to automatically detect what language a page is in and offer to translate it to your default language. This means you don’t have to copy and paste a page’s link to Google Translate. Translator to English is a Firefox extension that translates any text that you select to English by selecting the Translate Selection option from the right-click context menu.
The extension adds a Translate Selection option to the right click context menu. Select any text on a web page, right click it and select the translate option. The extension will translate the text directly on the page, no pop-ups or anything. The option to translate selection always remains active in the context menu whether or not you the selected text is in English.