Firefox will not play any type of videos while other browsers do??

Using windows 7, real player installed, cant plah any videos at all while other bowsers do.
Mozilla firefox 21.0 real playuer 16.0.2

You can check for problems with current Flash plugin versions and try these:
*disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
*disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
*disable hardware acceleration in the Flash plugin
*http://kb.mozillazine.org/Flash#Troubleshooting
*http://helpx.adobe.com/flash-player/kb/flash-player-113-crash-mozilla.html
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 or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Firefox will not play any type of videos while other browsers do??

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