Why do the developers of Firefox think it’s a good idea to display a notification bar to inform the user that a pop-up window has been blocked?
Meanwhile, Apple’s Safari doesn’t even bother to tell the user about blocked pop-ups because – let’s face it – web developers who think they can get away with this practice in the age of pop-up blockers, deserve to be shunned by web browsers.
Google Chrome has a very polite, yet meaningful way of informing users about pop-ups.
Chrome scores several usability points here, because it also allows us to disable the pop-up blocker for specific web sites.
A word about pop-under ads
They should be forbidden! (There is a special place in hell for developers who implement them.)
Seriously, why do browsers even allow windows to be made inactive on purpose or to be moved around? If a web app needs a pop-up for technical reasons, why would there be a scenario in which the user doesn’t need to interact with that window?