Chrome, Firefox, Opera, etc. has made an update to stop YT videos from stopping that from happening.
So to fix that here is something for you to do:
1. Depending on the browser that you are using type in: ChosenBrowser://flags
Example 1: Google Chrome: Chrome://flags/ | Opera: opera://flags
2. Go to the search option and type in autoplay and this should come up:
3. And click No Gesture Is Required:
4. Relaunch your chosen browser and ta-da!
Happy writing and listening!