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 ge

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/Getting_started https://developer.mozilla.org/en-US/Add-ons/SDK/Tutorials/Ge...