when starting firefox, compatability checker always runs and then the "hooray, your firefox is up to date" page always displays have tried various suggestions but no luck yet
firefox compatibility checker runs on each start of FF and Hooray, your FF is up to date always displayed too, have tried all the obvious like resetting homepage, but no joy
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Does this help ?
see Matt_G reply in : https://support.mozilla.org/en-US/questions/916778
thank you
Killing the content of the user.js file solved the issue thanks
Glad we helped, thanks for posting back.