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If all you need to do is inject Javascript into a webpage, you should be able to make a Firefox addon to do that in easily under an hour -- check out the SDK getting started guide at https://developer.mozilla.org/en-US/Add-ons/SDK/Tutorials/Ge...

Please give us a Firefox version! I'm begging you!

Seconded. This is one of the most incredibly useful projects I've seen in a long time.

In that case, why not make it available as a javascript bookmark?