New
#20
I would recommend this one:
Translate Web Pages – Get this Extension for 🦊 Firefox (en-US)
I saw that, but if you look at the one star reviews (I read 'em all, including higher) there is a disconcerting comment, admittedly dated 9mths ago, but still:
"Translate Web Pages appears to be injecting code into web pages even when it's not used - the developer was notified twice over a week ago, both through email and at github, and has not responded"