i don't know cPanel but i know differnt other panels _and_ i know phpMyAdmin, here you 've got different possibilities to handle the "login" and i guess the one you mentioned is not (only) htaccess-based but uses at least a combined method or even no htaccess at all, cause' esp. with FF you have to close _all_ instances to get rid of the user/pass combination which once has been entered to get a "second" chance to login with another one.

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