Unfortunately it does not survive a restart and session restore with multiple windows, which renders it pretty useless. (At least using the MySessions add-on. Not sure about the built in FF session restore. But as that is not reliable, I need an additional add-on. May also be that MySessions is crap, will probably try something else here. That's why it's still 3 stars.). This worked with the old FireTitle and the session manager plugins I was using, the Mozilla has chosen to break :(

Don't show separator if there is no title set.