Hey I've got the similar/s problem.
Fedora 18 Firefox is very problematic for me. It locks up after opening a web page, any web page. Complains about the plugin but doesn't find it.
Roger

Hi all,

I have a comprehensive listing of my plugins below, but Adobe says I have this installed
You have version 11,5,31,137 installed (Chrome works OK)
Firefox says I have the latest version installed File: libtotem-vegas-plugin.so
Version:
Shockwave Flash 11.1 r102 so I am confused as to why I cannot watch Flash Videos under Firefox.

I would be really grateful for some light on this.

Andrew Greig