Torbutton not showing up on Mac OS X 10.6.6/7 with Firefox 4.0

vidalia 0.2.10 and polipo (version as bundled with vidalia) start up fine, test in torbutton preferences reports success but no button to activate/deactivate torbutton shows up in neither the tool, status nor add-on bar

This happens with torbutton 1.3.1-alpha and 1.3.2-alpha

Besides torbutton the following add-ons are installed

Adblock Plus 1.3.3
BetterPrivacy 1.49
DOM Inspector 2.0.9
DownloaddHelper 4.8.4
Firebug 1.7.0
User Agent Switcher 0.7.3

Trac:
Username: torifiedUser

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