Hello Firefox Translation https://support.mozilla.org/en-US/kb/website-translation Is it about Automatically popup an offer to translate on sites. https://connect.mozilla.org/t5/discussions/page-translation-pop-ups-on-off-switch/m-p/86163 Go to Configuration Editor for Firefox Enter a search term '''browser.translations.automaticallyPopup''' and try value '''false''' Is it about Desactivate translation, if you want to do it. Go to Configuration Editor for Firefox https://support.mozilla.org/en-US/kb/about-config-editor-firefox Enter a search term '''browser.translations.enable''' and try value '''false'''