On Sun, 25 Mar 2012 23:58:05 -0400, Paul wrote:

I use the "session memory" feature on purpose - if I want Firefox
to open those windows the next time I boot, I "kill" Firefox
rather than quitting it, and that remembers everything
I was working on. It beats bookmarking 21 things, one at a time.

You can also just do a normal File - Exit to accomplish the same
thing. I used to do a 'kill process' but now I just use Exit since
it's easier.