Mozilla never really got any of that part of the Addons Manager working
correctly in Firefox, so SeaMonkey has the same weirdness. Mozilla is trying
to get away from recommending Plugins so I suspect in the near future some of
that stuff will be ripped out. If you want a specific Plugin, you just need to
go to it's official website and install it... you cannot install Plugins
through Firefox/SeaMonkey anyway... they have to be installed at the OS level.
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