Great functionality, but slows my firefox down massively. But my FF session might be an edge case with 20 open windows, one of them with 2500 tabs :D

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.

A good start but FF limitations are affecting it. Howver, letting the Mac variant default to cmd+, (since cmd+; apparently isn't assignable?) is bad and should have been replaced by almost anything else, namely a setting to allow the USER to pick. But the worst shortcoming seems to be that it doesn't save your window titles upon closing Firefox! So when you restart, you have a bunch of windows with the same default names, making it useless. And it can be a pain to go through them all and re-set them properly. Please find a way to store the windows names if FF closes or crashes!

It does not work yet, but I'm waiting...
Please, could you at least fix the shortcut to preferences? In mac, COMMAND+, is the system wide Application Preferences. You shouldn't use it for Crappy Firetitle. It broke the Firefox Preferences...