Hardware video decoding on Linux in 2026?

[UCyborg]

Are there any hacks to get this working on Linux version of Pale Moon or does it need to be supported explicitly by the browser? I have Linux Mint 22.2 installation working on an old laptop, both VAAPI and VDPAU are functional for video decoding in media players (at least H.264). Seems to be working in Firefox as well, at least after forcing use of amdgpu driver instead of radeon, the latter somehow causes Firefox to hang the entire machine.

I read about media.ffvpx.enabled pref, though disabling that just seems to disable 60 FPS videos. I have ffmpeg installation which supports VAAPI and VDPAU and read something about compiling Pale Moon to use system libraries. Could something in that direction work or maybe could something be done with official build by manipulating certain files in install directory, like putting system libs for handling video there or something similar to get the browser to use GPU to decode videos?