Ok, what's up with my Firefox

Its version 2.0.0.7 which I believe is more or less up to date, but its a bit buggy.

When I load up a few sites in different tabs, it sometimes forgets to update the URL in the address bar when I switch tabs. To get it to show the proper URL (for cutting and pasting to a message board for example) I have to refresh the page.

Any ideas what’s causing this?

Not specifically, no, but a starting point is always to nuke your cache. Edit - preferences - advanced - network - clear now. There’s also the Private Data but I doubt that’s your problem.