User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 Build ID: 20121010144125 Steps to reproduce: I created a new Firefox profile for this test, then typed http://meta.wikimedia.org/wiki/Special:Version into the address bar and hit enter. After the page loaded, I tried to change to the secure version of the site, so I went to the address bar and prepended the displayed address (which omits the scheme) with https:// and hit enter. Actual results: The protocol disappeared (since that is the Firefox behavior nowadays) and the page reloaded. However, the page reloaded using the original http, not with https. Expected results: The protocol should have been changed. This even “works” when I change the protocol to e.g. ftp:// – the page reloads happily using http, the ftp scheme is gone. However, if I try to use some nonsense like fooo://, I get the “unknown protocol” error. But going from that error page to ftp://meta.wikimedia...etc. goes back to _the original http://_! I am able to get to the secure site by changing the URL to something which Firefox does not receive as “equal”, e.g. by typing https://meta.wikimedia.org/wiki/Special:VERSION – even though this is server-side redirected to Special:Version, it works correctly. However, if, after this, I manually edit the URL to change e.g. the “.org” to “.orG”, Firefox recognizes the old URL and goes back to http _again_…