>>>The HTML loaded can be manipulated. The script can be inserted locally into any page as soon as it's loaded, and then the thus adjusted HTML can be reloaded into the browser control. This would require some coding - locating the position in the page head to insert the script into - but should work even without any temporary disk files.
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>>Yes, that would be a way to do it. It would take adding the script and an onmousedown attribute to the BODY tag, as well as reloading after changes as you say. Or does the script take care of that?
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>Well, it says "document.captureEvents(Event.MOUSEDOWN)", which should mean "mouse down anywhere in the document". Since he's already controlling any HTML before it's shown, he could insert the snippet at the appropriate position and that'd be the solution.

I have try this approach (event) and it does not work.
The rightclick was not cancel at all if you don't place an alert in the script.