FF 84.0.2 and on Linux Mint 20.0 Cinnamon and running the Hardware Enablement Kernel 5.8.0-36 and YouTube videos get frozen in a Stuttering mode with that annoying sound and the Videos frozen in that stuttering state. I have had to revert my system to an earlier system time-shift snapshot to get back to FF 84.0.1 but now I’m not protected for a critical security bug that was patched in FF 84.0.2!
Maybe I’ll try FF ESR add see if that works but has anyone ruining Ubuntu 20.1 Groovy Gorilla had any issue with FF 84.0.2 as Kernel 5.8 is the standard kernel for that Distro version. Mint 20 is still supposed to be using Kernel 5.4 by my newest laptop’s needs Kernel 5.6/Later and I’m only offered Kernel 5.8 as the current HWE Kernel option via Mint’s update manager that’s using the Ubuntu Kernel base options.