Thanks, Alan ~

Extensions: no more than a half-dozen, the most important being FlashBlock.

Themes: yeah, I've been lazy about deleting the ones I don't like.

Toolbars: Not a one.

Firewall: Once I had 1.0.7 reinstalled, I went to the Firefox Support forum. Right on top, in the "announcement" topic about the new release, are instructions about checking Norton Security if the FF upgrade won't connect to the Net.

However... the two or three times I tried the usual download/install, which has worked smoothly for all previous upgrades, NIS popped up to check permission just like it should, and of course I told it "yes". Maybe, for some glitchy reason, my answer to that pop-up isn't registering with the Norton ap...

I'm going to try again later today, probably, since I know I can fall back on 1.0.7 if 1.5 still won't run right. The same topic in the Support forum doesn't mention uninstalling older versions first, unless they're pre-1.0, but maybe I'll do that anyway.