Occurs when "new Firefox Button" is used (testet in Win7).
RBtray does not get the message and therefore isn't able to do anything. Similar problem to 3159133.
Cannot reproduce. Does it still happen with RBTray 4.2?
For me the problem persists. The same for FF5 Win7 x86
I did not had the problem after changing to Win7 x64, even with RBTray 4.1. Same for AcrobatReader X (#3159133), both applications in 32 bit mode.
Therefore I guess the problem only occurs on 32 bit OSes.