CentOS - Sep 2015 - gnash plug-in for firefox on CentOS 6

How, if at all, should I replace the flash
plug-in for firefox running on CentOS 6?

I've read that gnash is a prospect,
but it seems to not be in any of my repositories.

-- 
Michael   hennebry at web.cs.ndsu.NoDak.edu
"Sorry but your password must contain an uppercase letter, a number,
a haiku, a gang sign, a heiroglyph, and the blood of a virgin."
                                                              --  someeecards