My Firefox version is up to date, I restored Firefox to default settings, restarted, I downloaded latest version of Flash and it will not run, it crashes..

Mac, OSX 10.6.8 (up to date), Firefox 28.0 (up to date). Adobe Flash was downloaded and no videos will run on any web pages using Firefox. I reset Firefox to default settings and restarted. I get the message that Adobe Flash has crashed. Shut computer down, rebooted. Same thing. Uninstalled Flash and the videos run but very choppy, jumping in 5 second increments after freezing. Firefox freezes and has to be force quit. Installed an older version of Flash and it will run, but I get a warning that it is vulnerable. I have gone through this several times and checked all my updates and they are the latest available. Videos do not run on the latest version of Safari either.

Downgrade to FlashPlayer 12.
I will add a link to a related post later. Flash 13 causes problems, and is a known issue with some older MAC s.

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