How about adding ebuilds for most common mozilla plugins?
The problem I see with this is, how do we define most common? It's pretty easy to install the plugins from mozilla's extension page, but it would be pain to maintain the mass of ebuilds for it.
Now that mozilla plugins are available for installation easily to a user's personal profile, I think this issue is essentially solved for most people. I don't think adding mozilla plugins to portage is going to happen.
Seemant was asking about this, remind me about this bug # next time it gets brought up