Snort, great solution there. Flash is going down the tubes and is installed on fewer and fewer systems -- starting with people who refuse the unnecessary security hassle it has become.
If you want to create a browser plugin for the security conscious, you don't do in an environment that has been proven to be insecure time after time. If possible, you create it in in an environment that will continue to exist in a few years when even Chrome abandons it.
As to how many people are using TFA's plugin, people using obsolete browser versions (aka your widely deployed tech) are NOT the target audience! The target is people using plugins like certificate patrol to avoid blindly accepting any/all certificate changes presented to their browser.
I have other things to do than write browser plugins, thanks. You seem to to have some experience in flash development. Any chance you are a flash dev that has been seeing less work and are just knee-jerking in reaction to my pointing out that Flash is insecure?
If TFA had presented a browser add-on instead of a flash plugin the clueless might have been whining about "what about MY browser", but at least it would be usable by people with at least half a clue.