Comment 35 for bug 337352

Nicolò, as I describe on that page, a morphing window should be used when it is important for someone to respond to the event quickly, regardless of what else they’re doing. That's not true for the case of a file transfer being completed. As I wrote in the spec, a more sophisticated design would be a "Received Files" window, but the custom alert box is good enough for now.

Cody and Chris, thanks for your work on this. As Chris says, just the filename should be shown, not the URI. Comparing the screenshot with the mockup I see three other glitches:
(1) the quotes around the filename are '' (U+0027 U+0027), when they should be “” (U+201C U+201D)
(2) the sentence should end in a period, but does not
(3) the default button is "Open", but should be "OK".