No sound from Firefox 50.1.0 or now 57.0.4 with Mac OS X 10.10.4
-- I am now getting NO AUDIO from Firefox on my iMac running OS X 10.10.4 Yosemite. -- Audio is fine on Safari and on computer alerts, etc. -- I was running Firefox 50.1.0 when audio stopped. I have now upgraded to 57.0.4 and still no audio. -- I have tried to follow directions on the Mozilla site such as 'Clear Cache.' 'Check Some Firefox Settings,' 'Update Your Plug-ins," and 'HTML5 Audio and Video' but have not had any result. I also found the directions hard to follow.
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https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows
https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues
https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox
https://support.mozilla.org/en-US/kb/troubleshoot-issues-with-plugins-fix-problems
https://support.mozilla.org/en-US/kb/warning-unresponsive-plugin
Make sure you are not blocking content.
Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
One issue that seems more common lately is Firefox's Tracking Protection feature. When it is blocking content in a page, a shield icon will appear at the left end of the address bar next to the padlock icon. This article has more info on managing this feature: Tracking Protection {web link}