[kevb]

But for a user that legitimately wants to turn off images or javascript (why?), they won't want to see that message on every page. If the message only shows once then the problem the message was trying to avoid returns. If the message shows on every page legitimate users of the option are inconvenienced. Of course you could create yet another setting saying "Warn when I have obscure settings enabled"...

If the developers/designers of Firefox don't have a reasonably answer as to why a large enough amount of users would disable these settings, then they should be removed (or to avoid upsetting existing power user moved to about:config).