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Yes Auhsor, the same thing happens to me aswell, and I'm using Firefox. I have no idea what could be causing it, but surely it's not my connection or computer. source

Go to your network settings in your PS3 and disable your Media Server Connection. It seems to have a conflict with many Netgear and Linksys routers when connected wirelessly. source

All FB Java popups internal to apps are not functioning on Firefox, they are on IE6. Also, client side flash seems to have stopped working all together as well. source

I use google webmaster a lot and wanted to make sure that the errors that I had were not anything that was stopping google from crawling the site easily. So I addressed those issues and the tool was very good. I would have a problem with 2600 errors, because I would not have the time to go through that many errors. That would make the webmaster tool pretty much useless. So I would advise trying to figure out how to get rid of some of the errors so you can use the tool effectively. source

Another possible cause of this is some control throwing an exception inside OnHandleCreated or the associated HandleCreated event. I believe this can cause errors similar to what you're seeing. source