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Rated 4 out of 5 stars
I completely disagree with David, below... NoScript is not in any way easy to use, especially considering that it blocks more than scripts and setting it up as blacklist is complicated.
I have however run into a problem with YesScript. Running in 3.6 in Private Browsing mode, if I disable or even uninstall YesScript, the blacklist continues to function and block JS on those sites.