> But, on her computer, my mail appeared like it has been translated from French to English then to French again... After a bit of fiddling, I discovered that disabling the "suggest to automatically translate a website in a foreign language" option solved the issue... That every email, even in ProtonMail, is sent to Google even if, in this case, the translation should not happen (translation had been disabled for both French and English websites so there was no reason to think PM would be translated).

Sounds like a bug. I am going to disable the translation feature now, I never use it but have never bothered to turn it off completely.

It's a bug but what is to stop Google from sending everything you type in any textbox to Google? Have they said anywhere that they won't do such a thing? Completely trivial to do and extremely useful in providing data about you to Google that they could potentially never look at and use to train AI.

And what's to stop Mozilla from doing so? Or any other browser?

The simple fact that Firefox is Open Source, therefore auditable, while Chrome is not.

ps. Nope, Chromium is not Chrome.

So use Chromium?