Videos won't play in latest version

When will I learn that once I find a version of FF that works, not to update it? I was working with v20 for a long time, and it worked fine. Decided to update to latest version, and BAM! Videos don't play.
Tried safe mode, still same thing. No videos will play. Was fine this morning, but tried to watch CNN video and it would not play. Spinning circle just jumps around, doesn't spin. YouTube won't play either.
Portable version from Portable Apps works fine.

If you use extensions (Firefox/Tools > Add-ons > Extensions) that can block content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions aren't blocking content.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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