Thanks, Christina. Now that I'm back on my main computer (Firefox 2), everything looks normal again. I see what you mean about the two text samples being about the same size but different fonts. The main difference is that the letters in the second one look a little narrower, or closer together.

I imagine it was some appearance setting that I made. I'm puzzled, though, why it made the "small" text look bigger than the "normal" text. I suspect this may be just a bug in Firefox that'll get corrected in one of the next few releases.

It's not an especially urgent question in any case. The other computer is set up and ready to go but it's officially my spare, so I don't expect to be using it much unless this one quits.