Pretty good, just few things to improve:

-to add: at least one more 'translate text' direction (eg. for translation from foreign language to own AND from own language to chosen foreign) - with access to both from right-click menu
-to fix: add-on does not work on Firefox 'internal pages' (like about:addons etc.)

Everything else is almost perfect. Simple and reliable.

Простота и минимализм 5 из 5