Sensibly, the Firefox versions do not have a pop-up blocker at all because Firefox can do this itself.

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In trying to lure new customers, EarthLink has taken a unique approach with the pop-up blocker, one that just may be enough to get users to switch.

FORBES: Magazine Article

The solution was simple: turn off my pop-up blocker.

FORBES: Tips for WordPress Bloggers: Preview, Quotation Marks, Code, and Subscripts and Superscripts