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?

Hi FredMcD

I started up FIrefox in Safe Mode and yes, the issue is still there despite what platform I am viewing a video in. (I tested videos on YouTube, Facebook and a local news station.)

https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues

Yes, I had already tried all the trouble shooting on the link you just provided, before posting my original help question.

So, yes, to summarize those suggestions: • I don't have pop up windows blocked checked on to begin with • Cookies: my "use custom settings for history" were already the way outlined in the link (I allow them) • I have only a few extensions and fewer plugins - obsolete ones were already uninstalled or updated when I downloaded the first version of Quantum • I had a cleared cache (I do this frequently, at least once a day, regardless)

And the last one - disable ad-blocking software...I do use this (DuckDuckGo) but I had zero issues with Quantum until the 0.2 update, that extension is up to date, and safe mode did not resolve the issue. For trouble-shooting's sake, I disabled this, restarted Firefox, then tested videos on a few sites and the video playback did not improve, furthering my belief that this is not the pesky culprit.

You can check the Web Console and the Browser Console for media related messages.

• https://developer.mozilla.org/en/Tools/Web_Console
• https://developer.mozilla.org/en/Tools/Browser_Console

I'm afraid both of those links are over my pay grade understanding. I don't know code so both links info are foreign to me. The first link I couldn't even see if I could learn new skills, as it's a video, and well, I'm here cause videos don't play ;)

The second link, I opened the Browser Console and poked through what was there. Regardless of not knowing what to do with this info found here, nothing stood out that could explain my video playback issue with this upgrade. Everything looked like "font size errors, couldn't establish connections, and ID already exists"...

Try disabling Tracking Protection {web link}

Hi FredMcD - Disabling the internal Firefox Tracking Protection did not improve the video playback. I also tried turning off both the Tracking Protection AND my AdBlocker at the same time. (I restarted Firefox when I turned these off just to be extra sure.)

Nope. Even under those circumstances the video plays in the same manner as originally outlined, while audio goes forward as it should.

Since we're not finding the solution, is there a way to uninstall 59.0.2 and go back a version or two until this bug gets addressed? I can't work in a browser that is not playing videos... Thanks for any insights here.

First, Type about:preferences#advanced<enter> in the address bar. Under Advanced, Select Update.

[v56+] Type about:preferences#general<enter> in the address bar. Select Update.

Select Never Check For Updates.

Also turn off Use a background service to install updates <Windows Only>

Install Older Version Of Firefox {web link} Be sure to read everything here.

If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.

You should also check out Firefox; Extended Support Release {web link} ESR Notes System Requirements