Been using firefox awhile myself.

Some things that may have not been mentioned:

if you want to open multiple homepages, just put | between each link
ie: www,bogglers,com | mail,here,com

and Would just like to say, firefox 2.0 sucks. get a 1.# version and update it.
firefox 1.5.0.11 is the version I use. It does not have such an overboard gui, and they moved the tab x in 2.#, so.

but yea, great thread!