Yup, Firefox has it: https://browser.mt/ (itโs now a native part of Firefox)
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Hmm I donโt think itโs because of that feature, because it only runs when you explicitly ask it to translate a page for you. You should probably check your extensions, see if you have some redundant ones (a mistake people make is use multiple ad-blockers/anti-trackers, when just uBlock Origin + Firefoxโs defaults are usually good enough).