There's an interesting article over at Macworld, 'The Power User's Guide to Firefox'. It's even got some goodies for us Win and Gnu/Linux users.
cheers,
gary
Firefox Power Users
Something else that I just discovered about Firefox yesterday: you can type a term directly into the URL bar and it'll take you to the (or a) site. For instance, yesterday I wanted to post the link to Listamatic in response to something and rather than go through the various levels of my bookmarks (cos I've got quite a few subdirectories now ), I just typed in Listamatic and it brought the site up.
Be interesting to see how it actually works because I tried a few different searches and in some cases it would bring up the site that was obviously at the top of a Google search on the same term and other times it would bring up pages that I had visited before but were not necessarily the first ranked site.
Firefox Power Users
Another one I just discovered: Ctrl + # of a tab takes you to that tab (guess it only works if you've got less than 10).