I work daily on some sites, I open them even several times a day but Firefox periodically deletes them from the suggested urls, so that I have to rewrite them by hand each time. Most of the time they are quite long urls (for example to the admin area) so it is quite annoying to have to rewrite them in their entirety (or go looking for them in bookmarks). It also happens with urls that I keep open all day long like web.whatsapp.com, it happens that all of a sudden I start typing web. and instead of being completed with the site I visit most often I am offered something else visited who knows how long before. Why does this happen? Attached my search settings.