I figured it out. The session save feature bugs out when you have the downloads window open. If you close the download window, THEN the browser window (note: unless you have it specifically set to save sessions, you have to have more than one tab open for it to prompt you), it'll work fine.
I've been getting extensions to work with versions that they weren't designed to run with for a while now, heh. When I used the Gran Paradiso builds I had to do that a lot (though I just modified the package itself because I'm 1337).
Also, go to
about:robots. It's humorous and comes complete with an Army of Darkness reference.