I do not think there are any video / audio controls in Firefox except for the viewers provided by the plugins. Is there a site that gives you problems, or several sites?

It's not specific to any sites. No matter what site it is the audio is not as clear and crisp in firefox as it is in Chrome.

If you have both browsers on your computer give it a try and see if it's the same for you.

Let's try a test. Using Firefox, download one of those files. After, play the file in a video program. Is there any distortion?

Files played on video programs have the same quality as Chrome audio, meaning better then firefox.

Your System Details shows;

Installed Plug-ins

Adobe Shockwave for Director Netscape plug-in, version 12.1.3.153 Adobe Shockwave for Director Netscape plug-in, version 12.0.3.133

Having more than one version of a program may cause issues.

I'll uninstall the old version and see if that helps. Will report back.

Nothing changed. Same thing. Chrome audio quaility still much better then firefox for some reason.

I just discovered that under OPTIONS===>>APPLICATIONS in firefox there is a list of associated programs plugins including audio plugins. Could this have something to do with the difference in audio quality within firefox and if so what can I change in it to improve the audio?

Is this happening with a plugin like Flash or with the built-in HTML5 media player?

You can toggle these prefs to false on the about:config page to disable the HTML5 media player for some files like MP3 audio files and H.264 videos.

• media.windows-media-foundation.enabled
• media.directshow.enabled

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config