In recent versions, Apple as moved many of these options (such as Disable Images) into the Develop menu which has to be explicitly enabled via Preferences -> Ad

In recent versions, Apple as moved many of these options (such as Disable Images) into the Develop menu which has to be explicitly enabled via Preferences -> Advanced -> Show Develop Menu. I agree with many of the others on this thread that FireFox's about:config is not the place for these things. It is nice that FF has such low level access to such settings, but it is not much more friendly than editing an Apache config file. I am also a little concerned about moving these into Add-On which have their own set of issues for most people. How often have you sat at someone else's web browser to see it filled with all sorts of extra menu bars and enhancements that make the browsing experience even more confusing and slows every thing down (not to mention the potential privacy issues).