User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:32.0) Gecko/20100101 Firefox/32.0 Build ID: 20140916130324 Steps to reproduce: 0. Have lots of urls in history. Have youtube.com bookmarked so that its url autocompletes when typing 'y' into the urlbar. 1. Restart Firefox. 2. Type 'y' into the urlbar and quickly press Enter. Actual results: Autocompletion does not happen fast enough and Firefox proceeds to look up the literal domain 'y'. If you try this again, the cache is already warmed up and it will react faster than you can type. Expected results: The urlbar could have postponed my 'Enter' keypress until after autofill had done its job. Right now it seems it's working on a best-effort asynchronous basis.
we plan to add some buffering to the locationbar in future but that requires a quite huge architectural work. It started but I have no ETA to provide. Currently it's expected that the exact first search you do in the awesomebar is slower, cause it has to startup a bunch of components to be ready. That's an edge case for which we don't have any short term plans.