No sound in Firefox? Help!

[0092284]

So, updated to High Sierra Public Beta today, and everything works like a charm - Except Firefox.

No sound at all.

Plugins updated. Music from itunes and all other apps work fine.

Tried downloading a different version of Firefox and same result. A video from youtube plays, but not the sound.

Rebooted machine several times. Reset NRAM (or was it VRAM?) by holding option+cmd+r+p. Same result.

Anyone had a similar issue? Suggestions?

EDIT: Safari works fine. Seems Firefox has an issue with High Sierra.

 

[Spazturtle]

Having the same issue, telling Firefox to use ffmpeg doesn't fix it either.

 

[neeklamy]

There’s a bug logged for this on the Bugzilla, Bug 1376163 - [10.13] No audio playback on YouTube, no audio/video on Netflix (macOS High Sierra 10.13 Beta)

And there’s a fix.

Can someone try to re-enable e10s, and go to about:config, set "security.sandbox.content.level" to "0", restart the browser, and try again ?

This fixed my audio High Sierra beta 2.

Confirmed that e10s enabled and "security.sandbox.content.level" to "0" resolves the problem.

And for anyone who doesn’t know how to get to the about:config, just type about:config into the address bar. Much more detail from the Configuration Editor for Firefox article.

Depending on what version of Firefox you’re using and if you’re opted out of e10s (Mozilla’s cute short name for Electrolysis, their sandboxed browser engine tech), you may not have to re-enable e10s. This is what you might see in Firefox ▸ Preferences: