Disabling Firefox Security Warning
Does anyone know how to disable Firefox's security warning:
Although this page is encrypted, the information you have entered is to be sent over an unencrypted connection and could easily be read by a third party.
Are you sure you want to continue sending this information?
I have set all security.warn to false in about:config. I still get the annoying pop-up.
Thanks for the help.
Answer
Unfortunately, as of 12.x it still can't be disabled.
You can read a years-long argument here on bugzilla about this very issue. Log in and upvote it!
I have found complaints about this message going back at least six years. This is regularly reported on bugzilla and through the other Mozilla support sites and is a popular question on many other support forums. The main Moz devs apparently feel it is a critical security feature that should not be disabled. Personally I find it very annoying, I hit MSDN via Google searches all day long and I have to click through that stupid warning every time. If you see it a lot, it quickly becomes one of those warnings you automatically ignore which makes the "mandatory security feature" argument rather unconvincing.