|Thank you, sdfox 7. I think you identified the problem. |
I have Service Pack 3 installed, and version 18.104.22.16893 of Firefox, but my version of Flash Player was 10,1,53,64. I went on the Adobe update page and downloaded version 11, installed it, restarted the computer, and the browser opened normally. By "normally" I mean: it didn't hang up.
Thanks again for your help on this and on the quick reply. Greatly appreciated.