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How To Uninstall Fix Paste on Youtube

I am new to the manipulation of user scripts. I downloaded the Fix Paste on YouTube and and was unaware that I would have to download the Greasemonkey script program. Now, YouTube videos are very slow to load and I am still unable to paste comments in YouTube. Should I do the following:
1. Uninstall and reinstall Firefox.
2. Download the Greasemonkey program
3. Re-install the fix past on YouTube script

Please advise. As I await your answer, I am going to go too uninstall and reinstall Firefox, since it bothers me when YouTube videos are slow to load.

If you don't have Greasemonkey then the script won't be installed at all, it will just show a page with a bunch of codes in it. Just install GM and get back here and install the script.