Quicktime plugin not working in Firefox

I recently upgraded to Mac Lion and now find that I can not play .mp3 files embedded in web pages if viewed in Firefox. The same pages play okay in the same version of Firefox if running on SL10.6.8, or in Safari or Chrome on the Lion machine. I have checked the plugins list in Firefox and it shows that Quicktime is installed and enabled. I was also able to stream and watch videos (with audio) from the Apple web site. I just can't get embedded .mp3 files to play on a web play in Firefox. Any ideas?
llk

I have scoured the internet looking for a way to play MP3 files right in the browser window and have come up with nothing. Firefox does not let me set MP3 files to play with the QuickTime Plugin but instead I can only have them play in iTunes or QuickTime after a download. Pretty much same with Chrome and Safari. Neither will let me just play the MP3 right in the browser. Please help!

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Mac OSX
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I have scoured the internet looking for a way to play MP3 files right in the browser window and have come up with nothing. Firefox does not let me set MP3 files to play with the QuickTime Plugin but instead I can only have them play in iTunes or QuickTime after a download. Pretty much same with Chrome and Safari. Neither will let me just play the MP3 right in the browser. Please help!

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Oh yea, Im running FireFox 13.0.1, Windows 7, HP computer, Real Player is up to date.

Hey Chris,
I was able to duplicate this issue on my Windows 7 laptop as follows:
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     2) I then went out to the Firefox website and downloaded the "Firefox Setup 13.0.1.exe" app to my laptop. I ran this app to install Firefox.
     3) I then went to the following website http://www.ishmael.org.uk/karaoke02.php as I know that this URL uses Flash Player (obviously you can go to any URL that uses Flash Player - I'm just letting you know which one I used). I then clicked on the icon on this page to install Flash Player.
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To ensure that the above URL is not the culprit, I used one from your website http://helpx.adobe.com/flash-player/kb/find-version-flash-player.html and had the same results.
Hope this info helps!
Jeff
NOTE: As a reminder, I do not have RealPlayer installed on my laptop (and never have had it installed)

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[https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes Troubleshooting Extensions and Themes]
[https://support.mozilla.com/en-US/kb/Troubleshooting%20plugins Troubleshooting Plugins]
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