Firefox remembers what you write which can lead to some troubles if you misspelled a domain name, login name or other information in the past. The auto complete feature displays all possible results which means that the misspelled names are always shown as well which can lead to some confusion – especially when only one letter is missing or wrong.
Firefox offers no obvious way to clean single misspelled words or urls from the database, it looks like it is always delete all or none. There is however a simple way to get rid of those misspelled words easily. It is in fact that simple that I find it astonishing that many users have problems figuring it out.
All you need to do is to make the misspelled text popup, use your cursor keys to navigate to it and hit the delete button.
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thanx, never expected it to be this simple.