I also tried to start Pale Moon with environment variable MOZ_USE_OMTC=1 which was completely ineffective.
My GPU info on about:support as follows.
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Active Yes
Description Intel Open Source Technology Center -- Mesa DRI Intel(R) Haswell Mobile
Vendor ID Intel Open Source Technology Center
Device ID Mesa DRI Intel(R) Haswell Mobile
Driver Version 3.0 Mesa 10.3.2
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Name Pale Moon
Version 28.2.1 (64-bit)
Build ID 20181118201445
User Agent Mozilla/5.0 (X11; Linux x86_64; rv:60.9) Gecko/20100101 Goanna/4.1 Firefox/60.9 PaleMoon/28.2.1
OS Linux 3.16.0-4-amd64
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libva info: VA-API version 0.36.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_36
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.36 (libva 1.4.1)
vainfo: Driver version: Intel i965 driver for Intel(R) Haswell Mobile - 1.4.1
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Simple : VAEntrypointEncSlice
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointEncSlice
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileH264MultiviewHigh : VAEntrypointVLD
VAProfileH264MultiviewHigh : VAEntrypointEncSlice
VAProfileH264StereoHigh : VAEntrypointVLD
VAProfileH264StereoHigh : VAEntrypointEncSlice
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileNone : VAEntrypointVideoProc
VAProfileJPEGBaseline : VAEntrypointVLD
VAProfileH264MultiviewHigh : VAEntrypointVLD
VAProfileH264MultiviewHigh : VAEntrypointEncSlice
VAProfileH264StereoHigh : VAEntrypointVLD
VAProfileH264StereoHigh : VAEntrypointEncSlice
- Packages libgstreamer-vaapi1.0-0 gstreamer1.0-vaapi i965-va-driver are installed.
- VLC Media Player works fine and plays 4K videos at 60 FPS that would be an impossible task for the CPU. It also generates a lot of HW video decoding activity that can be seen in intel_gpu_top.