If there are issues with ranking of mistyped pages, we should fix those, rather than trying to workaroudn the problem by limiting history when it's not the problem at hand. Ideally mistyped pages should not survive long, but from some time we'd like to make the urlbar stricter in time, so have ranking fall much faster after few days. This a long term project. The urlbar has historically always tried to provide as many matches as possible, things that are not often visited should just be lower in results. IF you really want to do that, you can already do it with this add-on I made years ago https://addons.mozilla.org/firefox/addon/expire-history-by-days/
Bug 643254 Comment 51 Edit History
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If there are issues with ranking of mistyped pages, we should fix those, rather than trying to workaround the problem by limiting history when it's not the problem at hand. Ideally mistyped pages should not survive long, but from some time we'd like to make the urlbar stricter in time, so have ranking fall much faster after few days. This a long term project. The urlbar has historically always tried to provide as many matches as possible, things that are not often visited should just be lower in results. IF you really want to do that, you can already do it with this add-on I made years ago https://addons.mozilla.org/firefox/addon/expire-history-by-days/