After I removed Flash from my MacBook Pro, I was annoyed by frequent “Safari can’t find the Internet plug-in” warnings.
It turns out that ClickToFlash makes those warnings disappear. Meaning: Yes it does this when you have Flash installed, but it also does it if you don’t have Flash installed. You’ll see the “Flash” image where the Flash media would be, and won’t get the annoying pop-up.
Hat tip to Joe for this suggestion.
Seek Nuance 