Seems generally functional but as of this update I see the systemd log briefly before getting into the graphical environment. This does not occur with 5.10.9 which was the previous kernel I had. I haven't manually edited any boot parameters and I think my cmdline looks fine:
BOOT_IMAGE=(hd1,gpt2)/vmlinuz-5.10.12-100.fc32.x86_64 root=UUID=955c0e1d-0b27-4136-8dfe-0e0c4aee12e8 ro rd.driver.blacklist=nouveau modprobe.blacklist=nouveau nvidia-drm.modeset=1 rhgb quiet
Works fine on Intel HD 520.
It's Thunderbird 78.7.0 rather than 78.6.1 as the Bugzilla entry says, but I suppose that's okay since it's a newer version than that.