For web sites that have username/password text input fields, the browser usually handily offers to remember them for you (in my case, Safari puts them in my OS X keychain). This simply does not happen with certain web sites. The first example that comes to mind is vBulletin forums. Meaning you can't use a complex/random password unless you're willing to copy and paste it from somewhere each time. Are browsers detecting when to offer to remember these by "does this look like a username/password" heuristics and failing sometimes? How does this work behind the scenes? ---- **Edit: Fellow Safari users, check out this combo:** http://8-p.info/greasekit/ http://userscripts.org/scripts/show/8021 http://userscripts.org/scripts/show/28696