Did you check you settings in youtube in playback & performance? Not sure if this will help but worth a shot. This latest update has been a nightmare all around I see. I lost my ability to print and no matter what I do, it doesn't solve it.

Did you check you settings in youtube in playback & performance? Not sure if this will help but worth a shot. This latest update has been a nightmare all around I see. I lost my ability to print and no matter what I do, it doesn't solve it.

In chrome it works perfect, was there a firefox update that broke this? Or was it a youtube update?

You can look at these prefs on the about:config page to see what settings work for you to block autoplay.

• media.autoplay.default = 5 [0:allow;1:blockAudible;5:blockAll]
• media.autoplay.blocking_policy = 2
• media.autoplay.allow-extension-background-pages = false
• media.autoplay.block-event.enabled = true
• media.block-autoplay-until-in-foreground

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

• https://support.mozilla.org/en-US/kb/block-autoplay

Beast!

This one fixed it "media.autoplay.blocking_policy = 2 "

Do you know how to make it so YouTube remembers where I left off it seems to have stopped saving where I left a video off...

if I open a YouTube video in a tab that is not active, it will not autoplay, but as soon as I hover over and click on that tab it will start playing

New youtube tabs should not autoplay like you describe if you are blocking audio & video with no other changes.

make it so YouTube remembers where I left off

You need to be logged in to a youtube account with history enabled and it only works for longer videos that you have watched for a while.

Test in Troubleshoot Mode to rule out interference from extensions.

This one fixed! https://addons.mozilla.org/en-US/firefox/addon/video-resumer/