After installing Firefox 3 beta 3 for a quick mess around, I found my home button is now gone completely from my firefox 2 installation. Its not in the "customize" toolbar box at all.
WTF?
Full Version: Firefox 2 home button missing
Neowin Forums > Help & Discussion Center > Software Discussion & Assistance > Web Browser Discussion > Firefox (Gecko)
Got it. Firefox 3 moves the home button onto the bookmarks bar, which also changed my firefox 2 profile (they both use your same profile folder). So Just show your bookmarks bar, customize your buttons and drag it back 
You should create a new profile when testing, for that very reason.
Moved here
Moved here
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