Some Firefox users noticed playback issues on YouTube for several months. These affected high resolution videos only, from 1080p and up. To make matters worse, no clear pattern could be identified.
Some videos played fine, others would stop abruptly when they ran out of buffer.
How can I use those while keeping my watch history automatically sync’d between devices?
Can’t speak for invidious, but grayjay’s youtube plugin has a “Provide Youtube Activity” option in it’s settings to keep history synced.