When I start typing the few letters of a certain URL I always get the same (wrong) suggestion which is no longer valid because the URL changed. The old url was jira.nex.lan:8080. The new url is jira.nex.lan (port 80). I like being able to just type in "jira" and hit enter. This works great with chrome where I can delete predictions and it actually works. I already tried everything for firefox and nothing works: - Changed the URL for my bookmark from jira.nex.lan:8080 to jira.nex.lan. There are no bookmarks with the old url. - Deleted everything from my history matching jira.nex.lan:8080 - Deleted places.sqlite in my profile (which seems to have erased my entire history) - Press the down arrow button and select the prediction and press shift-delete or just delete. This doesn't work because it's the first prediction. Even if I arrow down and then back up to it, pressing shift-delete or delete just deletes the text from the address bar. The prediction always comes back next time. I went through the list and made sure to delete anything below the top that contained the url. After following all of these steps, when I type "jira" and hit enter, it still always goes to jira.nex.lan:8080. The only thing I can think of is deleting the entire .mozilla folder, which I expect would work, but it would wipe out all of my customization, which is not OK. I attached a gif where I try to do the shift-delete method.