I have Chrome installed for Flash videos but I eventually installed the Flash plugin (from Adobe's repo) so I can download them with Flashgot.
First Selinux was blocking it from working because it was denying ptrace ( https://bugzilla.redhat.com/show_bug.cgi?id=799584
Then I disabled that with
setsebool deny_ptrace off
deny_ptrace 0' would disable it permanently but doesn't work)
and deny_ptrace is now disabled (temporarily). Selinux doesn't complain anymore but Flash videos don't work in Firefox.
They work in Chrome which has Flash embedded but I want in Firefox so I can download the video (it's out-of-sync on the site).