I couldn't take it anymore and so I installed an Adobe Flash blocker extension for FireFox. I spent some 15 mins just now waiting for Flash to stop hogging the CPU so much so that Process Explorer was not able to be used, having to reboot the machine via the Big Red Switch [*], and then, AND THEN, having to do the whole thing over again because I stupidly told FireFox to restore my previous session which reloaded the page containing the Flash script that hogged the CPU. Sigh.
[*] I wish my current computer had the viscerally satisfying resistance and thunking sound that came with using the original IBM PC power switch.