TorButton 220.127.116.11 requires Navigation Bar
Using TorButton 18.104.22.168 with Firefox v8.0.1 on Windows XP32.
After installation of TorButton to a copy of Firefox configured with the Navigation Bar disabled, no TorButton icon is displayed on the UI. Using the Firefox UI 'Customise...' menu allows the TorButton button to be manually added to the Firefox Add-on/Menu bar though then leaves the button unclickable. If the Navigation Bar is then enabled the button starts to work, even though still located on the Add-on/Menu bar.
It appears to require the Navigation Bar be enabled in order to function.