I haven't tried it myself, but apparently it's a kind of reverse Noscript (hence the name).
"YesScript lets you make a blacklist of sites that aren't allowed to run JavaScript. Use YesScript on sites that annoy you or hog your system resources. One click to the icon in the status bar turns scripts on or off for the current site."
I had Ghostery, but didn't like it. It seemed to "talk too much".
Noscript can be paranoid (a feature, not a bug) and occasionally stop sites from working even if they are white-listed; I consider having to open a site in another browser sometimes less of a nuisance than having my main browser slowed down by dodgy JS.
Two add-ons anthropomorphized in one comment! I guess that's what happens when you spend so much time in front of a screen ;-)
ghostery does accomplish the same thing, the notifications can be turned off. You can explicitly turn on and off services all the time or in real time.
Ghostery is supposed to help you avoid tracking but is owned by Evidon (http://en.wikipedia.org/wiki/Evidon) so I feel like they have quite the conflict of interest.
I think all sites annoy me and hog my resources :) I like rejecting everything and then temporarily allowing sites that require it if I really think it would be useful.
I haven't tried it myself, but apparently it's a kind of reverse Noscript (hence the name).
"YesScript lets you make a blacklist of sites that aren't allowed to run JavaScript. Use YesScript on sites that annoy you or hog your system resources. One click to the icon in the status bar turns scripts on or off for the current site."
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