hello vordtriedek, which webmail provider do you use? try to [[Clear the cache - Delete temporary Internet files to fix common website issues|clear the cache]] & [[Delete cookies to remove the information websites have stored on your computer|cookies from site where you're having problems]] and reload the page. if this doesn't work please also try launching firefox in safe mode once and see what is going on there in order to rule out the interference of extensions... [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]