After a web page is loaded, it often keeps eating anywhere from 25% to 100% of my CPU. Sometimes, it's to render some excessive or poorly designed graphics somewhere, like an animated background. Other times, it is much more evil—unsolicited use of my CPU in somebody's supercomputer, for instance. I'd like a button that when pushed halts all further javascript execution in a given tab until the button is pushed again, or until a different web site is navigated to.

Please note, this is not the same as the already-existing "stop" button. That button does not stop further javascript execution.

How this is implemented, or what browser I would have to use (so long as it's not ie or safari) is unimportant to me.

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