I'm happy to hear you were able to fix your problem without having to take the trouble of walking over to another computer, logging in there and posting your question. You saved a bundle; Bitcointalk customer support engineer house calls are real expensive.
Not everyone is rich enough to have a second computer available. Also, perhaps you would care to explain how two computers in the same household, almost certainly running the same OS and browser settings, would have offered results different enough to circumvent the problem. Oh, wait, that would require some actual thought, which, as the original posts points out, seems in short supply around here.
Troubleshooting issues a random person has because they've decided to meddle with something they don't understand in Firefoxs privacy settings isn't something I'd care to fix myself... You could try it on a different browser on the same computer or on a smartphone or something. My computers all have different operating systems as their main os also, I don't see how installing the same thing on every computer does anything productive for increasing security (because it doesn't).
Further, you have to take into account that there are a lot of web browsers about (I'm glad you picked the best though).
What was the error and the fix you used, perhaps you could reproduce it here or on a new thread about it with screen shots to help any other new user that can't log in.