Flash is used a great deal for advertisements which most people aren't going to care is missing from a page but it will still trigger the pop over thing. I fin

Flash is used a great deal for advertisements which most people aren't going to care is missing from a page but it will still trigger the pop over thing. I find the prompting at the top of the page to be nuisance and people are likely to turn it off so they don't get prompted all the time. Advertisers and malicious sites will find a way to make it appear and then offer helpful instructions for getting rid of it. I would say for sites, that just push flash without detection, change from the missing puzzle piece icon to a non-obtrusive "run this flash content" play button. You could even add a checkbox to "always play content for this site". That way there's no annoying flash pop over and you only run flash when the user demands it on a case by case basis. This will have the added effect of encouraging content producers to migrate because heavily flash laden pages will just look ridiculous. For sites, that try to detect Flash, display their "you need flash" messages and respond accordingly to clicks to install. The potential risk here is that people will become accustom to these prompts and a site might try to exploit that to get people to download something nasty.