Spoofstick
Chris pointed out Spoofstick this afternoon on his blog (an anti-spoofing extension), so I installed it for Firefox, but it was too big for my tastes (font wise), didn’t fit my theme and such. So I’ve put a modified version online at my usual place which drastically cuts the font size for the text and halves the size of the “button” so that now it fits nicely in my theme. I have its text in light grey in the Toolbar now, just left of the upgrade button and spinning progress meter.
Enjoy. 
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Cool! How did you modify it? Did you use your 3l33t coding skilz?
I unpacked it (.xpi’s are just zip files), saw there was nothing inside but an install xml file and a .jar, so I unpacked the jar, found the .css file that determined font size and played with that. When that only changed the font size but still made my menubar double its vertical size, I realized that even if the button was not being drawn (I had disabled it), FireFox had allocated 32 pixels of space to fit it in, so I then edited some other file inside the .jar which held some simple “height=32 width=32 src=button.png” statements (found it with grep), halved those numbers, repacked the jar, repacked the zip, and then reinstalled the .xpi.