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I did notify the webmasters or webmistresses at salon.com a few days ago, but, however the code for it gets into the Salon.com pages, it is the user's own browser that is supposed to block pop-ups.
I've put a query on the Firefox support forums about the pop-under, and I am sure they will be able to tell me how to do it. Generally, Firefox compile their own lists of blocked pop-up URLS and add it to the updates they send out to Firefox users. This is unlike MS Explorer browser, where you can add to your own blocked sites list at will.