Youtube Videos are Stuttering
I am having stuttering its hard to see when watching a 30/60fps
Adblock plus and Hoxx VPN
- User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
First, try running Firefox in Safe Mode. According to your system details you are running an adblocking extension, which can cause video playback issues. The same could be said for a VPN (which you appear to be using), since that could significantly slow your internet speed.
You should also Upgrade your graphics drivers to use hardware acceleration and WebGL. if that doesn't help, try disabling hardware acceleration to see if performance improves.
I'd recommend taking a look at the Fix common audio and video issues document to see if anything there solves the issue for you.
If nothing there helps, try installing the Media Feature Pack for Windows that Firefox requires in order to play video content.
Hope this helps.