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I have working hardware acceleration with the ESR version and media.ffmpeg.vaapi.enabled in about:config, works out of the box.
Did you verify that you get hardware acceleration with a tool like MVP outside of the browser? You can use vainfo and intel-gpu-tools to verify supported codecs and hardware utilization. The intel-media-va-driver-non-free drivers might also work.
Finally, youtube is a good site to test hardware acceleration, Netflix doesn't support hardware acceleration in Linux.
VLC and mpv are working just fine with hardware acceleration, confirmed it with intel_gpu_top.
Still nothing on Firefox. Launched it with MOZ_X11_EGL=1, media.ffmpeg.vaapi.enabled is set to true. Tested with YouTube, still nothing. 😑
Sorry, I am out of ideas. I am running Firefox via Gnome on Wayland. The only thing I changed was the media.ffmpeg.vaapi.enabled flag within Firefox-ESR, everything else should be default (plus Firefox plugins which should not be relevant). Perhaps you could try to run Firefox-ESR with a new/default profile were you only change the media.ffmpeg.vaapi.enabled flag? Or a Debian live-cd with Gnome/Wayland?
Well, looks like I have found the cause: the TearFree set to true appears to block HW compositing / acceleration in Firefox: https://wiki.archlinux.org/title/intel_graphics#Tearing
I have now removed the config file and hardware accelerated video decoding now works just fine while running both Xfce and KDE Plasma.
Thanks for all the input!
@CryptGoat Did you try the flatpak version?
Thanks or the suggestion. The Flatpak is indeed doing just fine but it's not an option for a number of reasons, such as the Flatpak version not working with certain addons (KeePassXC-Browser cannot connect to KeePassXC).