This problem APPEARS to be solved or at least remediable thanks to the suggestions made by Actionparsnip and Wojox. Here is a copy of what i wrote to them:
"To Actionparsnip and Wojox:
"As I said, last night Firefox was running like a champ. I shut down the computer (completely) several times and, when I started it up again, everything, including Firefox, was operating normally.
"This morning, I turned on the computer and - nothing! with Firefox.
"This is the strangest thing I've ever seen on ANY computer, regardless of the operating system.
"So first, again, I followed your instructions, Actionparsnip. I ran the terminal instruction [mv ~/.mozilla ~/.mozilla_old] and, immediately after, and without trying Firefox, I shut down the computer.
"When I restarted it, there was a "brand-new" Firefox - but it still would not load any pages (including Ubuntu pages today even though yesterday, when I was having the problem, it WOULD load them!)
"So I then tried your suggestion Wojox
[1. Type about:config in the address bar, press Enter.
2. Find network.dns.disableIPv6 in the list.
3. Right-click -> Toggle. Set to true
4. Restart your Mozilla application and try again.]
and Firefox immediately loaded up pages. It seems to be working perfectly now. Of course, I wonder what will happen tomorrow morning!
"I hope this is the solution to the problem, though I can't understand why a Firefox "default" would cause this problem when it had never done so before. Nor can I understand why Firefox was working perfectly last night even though I had NOT changed the network.dns.disableiPv6 to True.
"As I said, this is STRANGE but at least I know now how to "fix" the problem should it recur. (I hope I don't have to do this every day!)
"Thanks again VERY much to both of you for helping me. I cannot tell you how much I appreciate your consideration and concern.
"Lawrence
"P.S. I really love these forums; with only one exception, I have never failed to receive solutions to any problems or concerns I may have had in using Ubuntu."
If this turns out to be a reproducible "bug," I do hope that someone can fix it. It somewhat spoiled for me the Ubuntu "experience." I will say however that, overall, I really like 'Karmic' and I hope it can go on to be the best Ubuntu release thus far. Thank you.
This problem APPEARS to be solved or at least remediable thanks to the suggestions made by Actionparsnip and Wojox. Here is a copy of what i wrote to them:
"To Actionparsnip and Wojox:
"As I said, last night Firefox was running like a champ. I shut down the computer (completely) several times and, when I started it up again, everything, including Firefox, was operating normally.
"This morning, I turned on the computer and - nothing! with Firefox.
"This is the strangest thing I've ever seen on ANY computer, regardless of the operating system.
"So first, again, I followed your instructions, Actionparsnip. I ran the terminal instruction [mv ~/.mozilla ~/.mozilla_old] and, immediately after, and without trying Firefox, I shut down the computer.
"When I restarted it, there was a "brand-new" Firefox - but it still would not load any pages (including Ubuntu pages today even though yesterday, when I was having the problem, it WOULD load them!)
"So I then tried your suggestion Wojox
[1. Type about:config in the address bar, press Enter. dns.disableIPv6 in the list.
2. Find network.
3. Right-click -> Toggle. Set to true
4. Restart your Mozilla application and try again.]
and Firefox immediately loaded up pages. It seems to be working perfectly now. Of course, I wonder what will happen tomorrow morning!
"I hope this is the solution to the problem, though I can't understand why a Firefox "default" would cause this problem when it had never done so before. Nor can I understand why Firefox was working perfectly last night even though I had NOT changed the network. dns.disableiPv6 to True.
"As I said, this is STRANGE but at least I know now how to "fix" the problem should it recur. (I hope I don't have to do this every day!)
"Thanks again VERY much to both of you for helping me. I cannot tell you how much I appreciate your consideration and concern.
"Lawrence
"P.S. I really love these forums; with only one exception, I have never failed to receive solutions to any problems or concerns I may have had in using Ubuntu."
If this turns out to be a reproducible "bug," I do hope that someone can fix it. It somewhat spoiled for me the Ubuntu "experience." I will say however that, overall, I really like 'Karmic' and I hope it can go on to be the best Ubuntu release thus far. Thank you.