I've tried installing Firesizer several times but I simply cannot find its icon either in my Addon Bar, my toolbar Customize menu, or my Firefox Tools dropdown. When I read similar complaints, the answer is always "You need to install the Addon Bar." I've had my Addon Bar for a couple of years now, and just did a fresh re-install of its current version for good measure. No Firesizer icon there, though. Thanks in advance!