Mit Shift und Delete können Fehleingaben durch dicke Finger wieder aus Firefox-Vorschlagslisten entfernt werden:
You once fat-fingered your login name to a web site and now Firefox suggests the typo every single time in the auto-complete dropdown. So annoying! But the Captain’s Universe web site has a quick tip on how to delete the bad suggestions:
Just start to type in into the form field until the grey dropdown appears, then use the cursor keys to move to the entry to be deleted and press the SHIFT key and the delete key. Voila!