If you set Firefox to block pop-ups, you get this message when a page requests a pop-up:
This is accompanied by a Preferences button with the following options:
Why only “allow pop-ups for this site”? Why not “allow this one pop-up that I’m pretty sure I want to see, but protect me from future nefarious pop-ups”?
This properly belongs in Bugzilla, but I’m sure the developers would tell me I’m stupid and ignore me. See, e.g., this bug that I voted for, like, two years ago.
UPDATE: As I suspected, Bugzilla has entries for why this isn’t really a bug and why you don’t want what you think you want.
Procrastiblog 