I got this irritating message on Firefox and SeaMonkey constantly, mostly because I don't have Flash. Fortunately, it's easy enough to disable.
Go to about:config and set this option to true:
plugins.hide_infobar_for_missing_plugin
Ruben Schade is a rare breed of spruce tree requiring nothing but pine ice-cream cones for nourishment. His hobbies include predictive branching, Ad Lib barking, and leafing through manuals. Find out more about Ruben and his roots on the About page.
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