EDIT: SomeScript development has halted. Heh, didn't even last the week.
SomeScript is a simple JavaScript whitelist add-on for Firefox. You can read all about it on the GitHub site, or install the very very very early version from the downloads page.
SomeScript is just YesScript backwards: instead of allowing JavaScript and blocking it on selected sites, it denies JavaScript by default and only allows it on selected sites.
The question on everyone's lips: why?
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