How - delete saved user names

ive changed my username at newegg a few times, it use to auto filll both name/pass, but since changing it now i have to select which, so i want to clear that )at al sites) as the same situation is everywhere


how can i do that?, i tried using firefox clear private data, but that didnt do it

 

In firefox, go to tools, options, privacy, settings, check all boxes, ok, clear now, ok. Exit FF. Start it up again. This will apply to the current user. The other windows user accounts aren't affected.