YesScript disables Javascript in websites that you specify in a blacklist.
https://addons.mozilla.org/en-us/firefox/addon/yesscript/
The author of YesScript says:
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 thinks that's a good evaluation. I found NoScript to be unusable and YesScript to usually be helpful. Some sites won't load with Javascript blocked, but most will.Unlike NoScript, YesScript does absolutely nothing to improve your security. I believe that Firefox is secure enough by default and that blocking all scripts by default is paranoia. YesScript strives to remove hassles from your browsing experience, rather than add them.