Yeah, that was the popup I was referencing - although it's much smaller for you than it was for me - maybe my low res laptop screen is a benefit there. It was n

Yeah, that was the popup I was referencing - although it's much smaller for you than it was for me - maybe my low res laptop screen is a benefit there. It was noticable enough to clue me that something weird was afoot, but I'm sure it could be disguised further. I think a fix could be: always show a select-program prompt even for unknown schemes (perhaps with a built-in link to the add-ons store a la Windows to find a program to open the "file" ;) ), never fail to a different page context than a successful launch would go to, and make the don't-ask-again checkbox domain specific to prevent random domains doing drive-by automatic launch detection. That seems to solve it without being too disruptive to existing convenience.