از این افزونه که اسمشو مینویسم استفاده کنید خیلی بهتره و همون صفحه ترجمه میکنه.
Translate Web Pages
https://addons.mozilla.org/en-US/firefox/addon/traduzir-paginas-web/?utm_content=addons-manager-reviews-link&utm_medium=firefox-browser&utm_source=firefox-browser

It's useful tool for me, but there's a bug, why when I select a text it doesn't show an icon or translate the text immediately like one that in google chrome web store?

It isnt that good because it has to open new page to translate

Having trouble using this. It don't work like in other browsers.

배울여고합니다

Works, but buggy. Causes videos to reload multiple times on opening a page, stuttering playback