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A few of the options I remember being able to easily turn-off are flash, images, pop-ups, javascript etc. In fact, I think these are the default things on the toolbar -- but many, many more can be added.
I can't remember who makes this toolbar, or what the name of it is. If you know the toolbar I'm talking about, could you please PM the name, or give me a clue! :) Thanks.
http://webdeveloper.mozdev.org/ [webdeveloper.mozdev.org]