User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:13.0) Gecko/20100101 Firefox/13.0 Build ID: 20120508180640 Steps to reproduce: You do a typing error on a page address and you get HTTP 404 E.g. type in https://github.com/miohtama/foobar (page does not exist) Actual results: The URL gets on Awesomebar auto-completion list. Now when you type in on the URL bar: github foobar It auto-completes a page which really does not exist. Expected results: 404s should not be added to awesomebar. Because next time you start typing the address, even correctly this time, it will pick up mistyped address and go there instead. If 404s cannot be filtered out from awesomebar a foundable user interface should be provided so that the user can remove the bad entry next time it autocompletes.

404 URLs could be temporary and it makes sense to remember them in the history