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Linguist, an ultimate translation browser extension
(vitonsky.net)
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I have to say, the quality of the English translation doesn't seem great at first glance... but between offline, no tracking, and open source, this is wonderful. Keep up the good work!
It seems it's also possible to add your own translation service.
But, in any case the default is to use google translator so be sure to check it's settings. It's accessible from the installed addons menu of firefox. Click on this addon and then the 3 dots button in the corner, then options.
Same applies for Text To Speech.