Rated 5 out of 5 stars
I think I may have installed this by simply changing the max Version line in the xpi, as noted by a previous reviewer (but really, can that make Firefox delete your whole profile? Corrupt your OS? Maybe it will also cause the computer to explode?).
At any rate, maybe it doesn't have some functions, but I find it great just for the simple means of stopping annoying flashing forum avatars and signatures and stuff like that. Excellent.