Yep, I know the one you mean. It has only ever appeared when there were updates to install. I’ve got Firefox configured to auto-install updates, and when I checked out Options>Advanced>Update History there was this message:
Firefox 188.8.131.52 (2006030804)
Installed on: Friday, 14 April, 2006 11:59:38 a.m.
Status: The Update was successfully installed
So, I went to my firewall & sure enough there was the new Firefox version with “Access Denied”. Changed that to “Allow” and…Rik was right on the money!
Everything’s running sweetly again.
Many thanks to both of you for your advice!