Unresponsive Script message in Firefox

I keep getting this pop-up warning box "Unresponsive script: chrome://ytoolbar/content/utils.js:60" when ever I open any page on Firefox. The page will not load until I press "stop script". This is really slowing things down on the internet. I tried the Firefox site, but didn't find anything for Macs. I could go back to using Safari, but don't like it as well and all my bookmarks are in Firefox.
Please help!

The FF Mozilla help page really scared me with this step in the precess:
<In the Location bar, type about:config and press EnterReturn.
* The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page. >
I did take everyone advice and carefully checked my add-ons and extensions especially Google ones, and Guess what? One of them actually warned that it was not compatible with the latest FF I had just downloaded.
Thanks once again for great help when I panic.

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