Your browser updated to Firefox 8 this morning, actually. I'm looking at the logs and you were using Firefox 7.0.1 all the way until around 5:30am EST this morning. Then about an hour later you returned and you were using Firefox 8.
I bet what happened is that your Firefox got messed up during an update and once the update was complete then it was working again. That was a buggy upgrade for Firefox and shame on them.
