Torbutton Addon interferes with toolbar buttons for add-ons (including its own)
If Torbutton 1.2.5 is enabled in Firefox 3.6.3 64 bit Linux additional Firefox windows (either launching a second instance of Firefox or selecting File->New Window) are missing any toolbar buttons for add-ons (such as icons for Flashblock, AdBlock, and Torbutton). The buttons are also missing if a "restart" of Firefox is performed (as opposed to closing and restarting Firefox which does not cause the problem). It does not matter if you actually choose to display the Torbutton status in the toolbar or not for this to happen, and icons in the status bar are not affected. Disabling Torbutton results in the icons appearing in all Firefox windows. This behavior is also caused independently by the Ubuntu add-on Ubuntu Firefox Modifications 0.9rc2 and I have reported it to them as well. However, either of these add-ons causes this behavior alone and it does not appear to be an interaction between the two.