FF3 Scripting Error

I recently updated to Portable FF3 and starting noticing a performance degradation and get the following message:

"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: file:///W:/PortableApps/FirefoxPortable/Data/profile/extensions/%7B73a6fe31-595d-460b-a920-fcc0f8843232%7D/components/noscriptService.js:5121"

When this occurs, I see a 2nd window popup with a reference to the current FF3 that's running. It takes 20-30 secs or so, then it goes away and the page loads properly.

I am running Adblock Plus, IE Tab, and No Script. If I turn No Script off, the issue goes away. I use iGoogle as my home page, with Youtube as one of my add-ons. It seems to be related to a XSS script to Youtube.

I completely removed FF3 and re-installed it thinking I had a bad copy, but it's still doing it.

Thanks for any help that you can offer.

menfal9@yahoo.com