Haven't seen anything. I use Internet Explorer. judy

It means there was a java script error on the page on the page you were trying to access. Not uncommon at all. There's nothing "wrong" with your computer and I wouldn't worry about it. I tried to post this message with java and script as one word. GW didn't like that.

I do have a Windows 7 laptop, but I still prefer using my desktop which is XP. I'm much more comfortable sitting in my nice desk chair and using a regular keyboard. I'd love a desktop with Windows 7, but I don't have room for another computer or even storage space if I keep this one, too. I have no intention of getting Windows 8 because at my age I'm wanting to take things easy, not get frustrated with a computer. I keep thinking of putting Ubuntu on the old desktop and using that until it gives up the ghost, but that might lead to frustrations, too. I've loved fiddling with computers, but now there are other things I want to spend my time doing. I have a smart phone, a couple of tablets and an e-reader, so I really have more gadgets than I have time. Enjoy photography, too, so we'll just see what develops. Thanks, all.

While you're waiting on someone better qualified, have you read this? https://github.com/dadler/thumbnail-zoom/issues/166 I'm not sure the issue even gets resolved there but it does seem to point to your "Thumbnail Zoom Plus" extension. A corrupt Firefox profile? A conflict with another extension? Personally, I'd be tempted to disable all extensions except "Thumbnail Zoom Plus", see if the freezing goes away. If it did, I'd enable the other extensions one by one, testing along the way. On the other hand, If disabling all extensions except "Thumbnail Zoom Plus" didn't cause the freezes to go away, I'd maybe reset Firefox. If resetting didn't resolve the issue, I'd remove Firefox completely, including my profile, and reinstall it. I'm not a technician though, just saying what I might do. BTW, I just added Thumbnail Zoom Plus 3.1 to Firefox 32.0.3 to test and other than being a bit picky about how I move my mouse in to hover, it worked okay. Meaning no freezes or script errors. I'm on Linux though. If I were on Windows, I might consider the possibility of a conflict with my AV. Someone else could tell you whether or not that's a likelihood though. Opps, I's so slow I see Mikie already gave you good advice. I'll go ahead and submit it though... just in case something helps, say in the bug report I linked too.