Comment 28 for bug 867424

(In reply to desrt from comment #16)
> There is really no good reason for this code to exist anymore. I ended up
> with libgnome installed as a dependency for another old program and my
> Firefox install started misbehaving as a (nearly untracable) sideeffect of
> that. It took me quite a while to figure out that a Firefox bug could be
> triggered as a result of installing an unrelated program.
>
> The fact that I didn't have libgnome installed before, and everything was
> working just fine, is as much of an indication as any that this code needs
> to die.
I think this is explained by bug #557601 comment #8 - firefox blocks shutdown for important asynchronous events when you ask it to quit, but not when the session manager asks. I don't think attachment 608321 addresses this any better than the current code does, so a fix is needed for bug #557601 in any case.

I hope someone with more knowledge of asynchronous shutdown can tell whether my analysis is correct and can point to the best way to fix this.