Cannot get VAAPI to work on firefox

I followed all the steps over at arch wiki entry for firefox#Hardware_video_acceleration but I still can’t get it to work.

From looking at the firefox logs this seems the most relevant

[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Initialising VA-API FFmpeg decoder
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule AudioTrimmer[0x7ff038cb6fc0] ::HandleDecodedResult: sample[0,21000] (decoded[0,13500] no trimming needed
libva error: vaGetDriverNameByIndex() failed with unknown libva error, driver_name = (null)
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Failed to create VA-API device context

This is the full firefox log from having set:

MOZ_LOG="PlatformDecoderModule:5"

Can't find symbol 'eglGetNativeClientBufferANDROID'.                                                                             
Can't find symbol 'eglQuerySurfacePointerANGLE'.
Can't find symbol 'eglCreateStreamProducerD3DTextureANGLE'.
Can't find symbol 'eglStreamPostD3DTextureANGLE'.
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: Main Thread]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: MediaController #1]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: MediaController #1]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: MediaController #1]: D/PlatformDecoderModule Sandbox decoder supports requested type
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule AudioTrimmer[0x7ff038cb6fc0] ::Decode: sample[0,21000] no trimming information
[RDD 8853: MediaPDecoder #1]: D/PlatformDecoderModule OpusDataDecoder[0x7f5380766200] ::Decode: Opus decoder skipping 312 of 960 frames
[Child 8715: MediaController #2]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Initialising VA-API FFmpeg decoder
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule AudioTrimmer[0x7ff038cb6fc0] ::HandleDecodedResult: sample[0,21000] (decoded[0,13500] no trimming needed
libva error: vaGetDriverNameByIndex() failed with unknown libva error, driver_name = (null)
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Failed to create VA-API device context
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Initialising FFmpeg decoder.
[h264 @ 0x7ff038e66800] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x7ff038e66800] nal_unit_type: 8(PPS), nal_ref_idc: 3
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule FFmpeg init successful.
[h264 @ 0x7ff038e66800] nal_unit_type: 5(IDR), nal_ref_idc: 1
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Choosing FFmpeg pixel format for video decoding.
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Requesting pixel format YUV420P.
[h264 @ 0x7ff038e66800] Format yuv420p chosen by get_format().
[h264 @ 0x7ff038e66800] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0x7ff038e66800] no picture 
[h264 @ 0x7ff038e67000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[h264 @ 0x7ff038e69800] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 0x7ff038e6b000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 0x7ff038e66800] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule DMABUF/VA-API Got one frame output with pts=0dts=0 duration=16666 opaque=-9223372036854775808
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Got one frame output with pts=0 dts=0 duration=16666 opaque=-9223372036854775808
[Child 8715: MediaController #2]: D/PlatformDecoderModule Sandbox decoder rejects requested type
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule Initialising VA-API FFmpeg decoder
[Child 8715: MediaController #2]: D/PlatformDecoderModule Sandbox decoder supports requested type
libva error: vaGetDriverNameByIndex() failed with unknown libva error, driver_name = (null)
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule Failed to create VA-API device context
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule Initialising FFmpeg decoder.
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule AudioTrimmer[0x7ff038d660c0] ::Decode: sample[0,21000] no trimming information
[h264 @ 0x7ff037675800] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x7ff037675800] nal_unit_type: 8(PPS), nal_ref_idc: 3
[RDD 8853: MediaPDecoder #1]: D/PlatformDecoderModule OpusDataDecoder[0x7f5380766dd0] ::Decode: Opus decoder skipping 312 of 960 frames
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule FFmpeg init successful.
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule AudioTrimmer[0x7ff038d660c0] ::HandleDecodedResult: sample[0,21000] (decoded[0,13500] no trimming needed
[h264 @ 0x7ff037675800] nal_unit_type: 5(IDR), nal_ref_idc: 1
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Choosing FFmpeg pixel format for video decoding.
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Requesting pixel format YUV420P.
[h264 @ 0x7ff037675800] Format yuv420p chosen by get_format().
[h264 @ 0x7ff037675800] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0x7ff037675800] no picture 
[h264 @ 0x7ff037676000] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[h264 @ 0x7ff037676800] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 0x7ff037677800] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[h264 @ 0x7ff037675800] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 0
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule DMABUF/VA-API Got one frame output with pts=0dts=0 duration=16666 opaque=-9223372036854775808
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule Got one frame output with pts=0 dts=0 duration=16666 opaque=-9223372036854775808
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule AudioTrimmer[0x7ff038d660c0] ::Decode: sample[21000,41000] no trimming information
[Child 8715: MediaPDecoder #1]: D/PlatformDecoderModule AudioTrimmer[0x7ff038d660c0] ::HandleDecodedResult: sample[21000,41000] (decoded[14500,34500] no trimming needed
[Child 8715: MediaPDecoder #3]: D/PlatformDecoderModule AudioTrimmer[0x7ff038d660c0] ::Decode: sample[41000,61000] no trimming information
[Child 8715: MediaPDecoder #2]: D/PlatformDecoderModule AudioTrimmer[0x7ff038d660c0] ::HandleDecodedResult: sample[41000,61000]

Here is my system information

System:
  Kernel: 5.8.11-1-MANJARO x86_64 bits: 64 compiler: N/A 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.8-x86_64 
  root=UUID=acba3298-1a44-4be0-a80a-70fe66871e50 rw quiet 
  cryptdevice=UUID=3aa8acd6-248d-4eaf-bd53-68e107be9820:luks-3aa8acd6-248d-4eaf-bd53-68e107be9820 
  root=/dev/mapper/luks-3aa8acd6-248d-4eaf-bd53-68e107be9820 apparmor=1 
  security=apparmor udev.log_priority=3 
  Desktop: GNOME 3.36.6 tk: GTK 3.24.23 wm: gnome-shell dm: GDM 3.36.3 
  Distro: Manjaro Linux 
Machine:
  Type: Laptop System: Dell product: Vostro 5581 v: N/A serial: <filter> 
  Chassis: type: 10 serial: <filter> 
  Mobo: Dell model: 03H24J v: A00 serial: <filter> UEFI: Dell v: 2.2.0 
  date: 03/24/2019 
Battery:
  ID-1: BAT0 charge: 34.6 Wh condition: 34.6/42.0 Wh (82%) volts: 12.7/11.4 
  model: BYD DELL 1VX1H93 type: Li-poly serial: <filter> status: Full 
Memory:
  RAM: total: 15.33 GiB used: 2.25 GiB (14.7%) 
  RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Topology: Quad Core model: Intel Core i5-8265U bits: 64 type: MT MCP 
  arch: Kaby Lake family: 6 model-id: 8E (142) stepping: B (11) microcode: D6 
  L2 cache: 6144 KiB bogomips: 28808 
  Speed: 700 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 700 2: 700 3: 701 
  4: 700 5: 700 6: 700 7: 700 8: 700 
  Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat arch_capabilities 
  arch_perfmon art avx avx2 bmi1 bmi2 bts clflush clflushopt cmov constant_tsc 
  cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64 dtherm dts epb ept ept_ad erms 
  est f16c flexpriority flush_l1d fma fpu fsgsbase fxsr ht hwp hwp_act_window 
  hwp_epp hwp_notify ibpb ibrs ida intel_pt invpcid invpcid_single lahf_lm lm 
  mca mce md_clear mmx monitor movbe mpx msr mtrr nonstop_tsc nopl nx pae pat 
  pbe pcid pclmulqdq pdcm pdpe1gb pebs pge pln pni popcnt pse pse36 pts rdrand 
  rdseed rdtscp rep_good sdbg sep smap smep ss ssbd sse sse2 sse4_1 sse4_2 
  ssse3 stibp syscall tm tm2 tpr_shadow tsc tsc_adjust tsc_deadline_timer vme 
  vmx vnmi vpid x2apic xgetbv1 xsave xsavec xsaveopt xsaves xtopology xtpr 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf status: Not affected 
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, 
  IBRS_FW, STIBP: conditional, RSB filling 
  Type: srbds mitigation: Microcode 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: Intel UHD Graphics 620 vendor: Dell driver: i915 v: kernel 
  bus ID: 00:02.0 chip ID: 8086:3ea0 
  Device-2: NVIDIA GM108M [GeForce MX130] vendor: Dell driver: nvidia 
  v: 450.66 alternate: nouveau,nvidia_drm bus ID: 02:00.0 chip ID: 10de:174d 
  Device-3: Microdia Integrated_Webcam_HD type: USB driver: uvcvideo 
  bus ID: 1-6:4 chip ID: 0c45:671f 
  Display: x11 server: X.org 1.20.9 compositor: gnome-shell 
  driver: modesetting,nvidia alternate: fbdev,intel,nouveau,nv,vesa 
  resolution: <xdpyinfo missing> 
  OpenGL: renderer: Mesa Intel UHD Graphics 620 (WHL GT2) v: 4.6 Mesa 20.1.8 
  direct render: Yes 
Audio:
  Device-1: Intel Cannon Point-LP High Definition Audio vendor: Dell 
  driver: snd_hda_intel v: kernel alternate: snd_soc_skl,snd_sof_pci 
  bus ID: 00:1f.3 chip ID: 8086:9dc8 
  Sound Server: ALSA v: k5.8.11-1-MANJARO 
Network:
  Device-1: Intel Cannon Point-LP CNVi [Wireless-AC] driver: iwlwifi v: kernel 
  port: 5000 bus ID: 00:14.3 chip ID: 8086:9df0 
  IF: wlo1 state: up mac: <filter> 
  IP v4: <filter> type: dynamic noprefixroute scope: global 
  broadcast: <filter> 
  IP v6: <filter> type: noprefixroute scope: link 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Dell driver: r8169 v: kernel port: 3000 bus ID: 03:00.0 
  chip ID: 10ec:8168 
  IF: enp3s0 state: down mac: <filter> 
  IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A 
  IP v4: <filter> scope: global 
  IP v6: <filter> virtual: stable-privacy scope: link 
  IF-ID-2: virbr0 state: down mac: <filter> 
  IP v4: <filter> scope: global broadcast: <filter> 
  IF-ID-3: virbr0-nic state: down mac: <filter> 
  WAN IP: <filter> 
Drives:
  Local Storage: total: 1.38 TiB used: 777.22 GiB (55.2%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/sda vendor: Western Digital model: WD10SPZX-75Z10T2 
  size: 931.51 GiB block size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  rotation: 5400 rpm serial: <filter> rev: 1A03 scheme: GPT 
  ID-2: /dev/sdb vendor: Eaget model: SSD S300L size: 476.94 GiB block size: 
  physical: 512 B logical: 512 B speed: 6.0 Gb/s serial: <filter> rev: 9A0 
  scheme: GPT 
  Message: No Optical or Floppy data was found. 
RAID:
  Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci 
  v: 3.0 port: 5060 bus ID: 00:17.0 chip ID: 8086.282a rev: 30 
Partition:
  ID-1: / raw size: 58.30 GiB size: 57.13 GiB (98.00%) used: 24.97 GiB (43.7%) 
  fs: ext4 dev: /dev/dm-0 label: N/A 
  uuid: acba3298-1a44-4be0-a80a-70fe66871e50 
  ID-2: /boot/efi raw size: 300.0 MiB size: 299.4 MiB (99.80%) 
  used: 492 KiB (0.2%) fs: vfat dev: /dev/sdb7 label: N/A uuid: DD95-4162 
  ID-3: /mnt/Games raw size: 443.23 GiB size: 443.23 GiB (100.00%) 
  used: 258.82 GiB (58.4%) fs: ntfs dev: /dev/sda2 label: Games 
  uuid: 94E2AA73E2AA596E 
  ID-4: /mnt/Media raw size: 488.28 GiB size: 488.28 GiB (100.00%) 
  used: 268.79 GiB (55.0%) fs: ntfs dev: /dev/sda1 label: Media 
  uuid: 10DA317ADA315D62 
  ID-5: /mnt/SSDntfs raw size: 116.63 GiB size: 116.63 GiB (100.00%) 
  used: 41.93 GiB (35.9%) fs: ntfs dev: /dev/sdb4 label: SSD 
  uuid: E89619119618E23C 
  ID-6: /mnt/Stuff raw size: 52.43 GiB size: 51.36 GiB (97.95%) 
  used: 32.84 GiB (64.0%) fs: ext4 dev: /dev/sdb8 label: Stuff 
  uuid: 6f56e15c-2904-4b07-8e9e-ad7e5542f4fd 
  ID-7: /mnt/Windows raw size: 248.73 GiB size: 248.73 GiB (100.00%) 
  used: 149.87 GiB (60.3%) fs: ntfs dev: /dev/sdb5 label: N/A 
  uuid: 662E68F42E68BEA5 
Swap:
  Alert: No Swap data was found. 
Unmounted:
  ID-1: /dev/sdb1 size: 450.0 MiB fs: ntfs label: Recovery 
  uuid: EC3C48443C480C50 
  ID-2: /dev/sdb2 size: 99.0 MiB fs: vfat label: N/A uuid: 3E55-6418 
  ID-3: /dev/sdb3 size: 16.0 MiB fs: <superuser/root required> label: N/A 
  uuid: N/A 
  ID-4: /dev/sdb6 size: 58.30 GiB fs: crypto_luks label: N/A 
  uuid: 3aa8acd6-248d-4eaf-bd53-68e107be9820 
USB:
  Device-1: 0-0:0 info: N/A type: N/A driver: N/A rev: N/A chip ID: 
  Hub: 1-0:1 info: Full speed (or root) Hub ports: 12 rev: 2.0 speed: 480 Mb/s 
  chip ID: 1d6b:0002 
  Device-1: 1-2:2 info: Holtek OBINS type: Keyboard,HID 
  driver: hid-generic,usbhid interfaces: 4 rev: 2.0 speed: 12 Mb/s 
  chip ID: 04d9:a293 serial: <filter> 
  Device-2: 1-3:3 info: SteelSeries ApS SteelSeries Rival 300 Gaming Mouse 
  type: HID,Mouse driver: hid-generic,usbhid interfaces: 3 rev: 1.1 
  speed: 12 Mb/s chip ID: 1038:1710 
  Device-3: 1-6:4 info: Microdia Integrated_Webcam_HD type: Video 
  driver: uvcvideo interfaces: 2 rev: 2.0 speed: 480 Mb/s chip ID: 0c45:671f 
  Device-4: 1-10:5 info: Intel Bluetooth 9460/9560 Jefferson Peak (JfP) 
  type: Bluetooth driver: btusb interfaces: 2 rev: 2.0 speed: 12 Mb/s 
  chip ID: 8087:0aaa 
  Hub: 2-0:1 info: Full speed (or root) Hub ports: 6 rev: 3.1 speed: 10 Gb/s 
  chip ID: 1d6b:0003 
Sensors:
  System Temperatures: cpu: 49.0 C mobo: N/A 
  Fan Speeds (RPM): cpu: 3426 
Info:
  Processes: 336 Uptime: 12m Init: systemd v: 246 Compilers: gcc: 10.2.0 
  Packages: pacman: 1416 lib: 458 flatpak: 0 Shell: Zsh v: 5.8 
  running in: gnome-terminal inxi: 3.1.05 
1 Like

You’re running hybrid drivers… Did you start Firefox with prime-run ?

:thinking:

I had the same problem with Manjaro on a PRIME laptop setup although I was using the iGPU for rendering the screen as reported by about:support. Didn’t found a fix :frowning:

Looks like this is not limited to Intel graphics chips only.
With the Nvidia driver 390, I get similar results trying to play a YouTube video:

[Child 17734: Main Thread]: D/PlatformDecoderModule Agnostic decoder rejects requested type
[Child 17734: Main Thread]: D/PlatformDecoderModule Sandbox RDD decoder rejects requested type
[Child 17734: MediaSupervisor #2]: D/PlatformDecoderModule Sandbox GPU decoder rejects requested type
[Child 17734: MediaSupervisor #2]: D/PlatformDecoderModule Agnostic decoder rejects requested type
[Child 17734: MediaSupervisor #2]: D/PlatformDecoderModule Sandbox RDD decoder rejects requested type
[Child 17734: MediaSupervisor #2]: D/PlatformDecoderModule Sandbox GPU decoder rejects requested type
[Child 17734: MediaSupervisor #2]: D/PlatformDecoderModule Agnostic decoder rejects requested type
[Child 17734: MediaSupervisor #2]: D/PlatformDecoderModule Sandbox RDD decoder rejects requested type
[Child 17734: MediaSupervisor #1]: D/PlatformDecoderModule Sandbox GPU decoder rejects requested type
[Child 17734: MediaSupervisor #1]: D/PlatformDecoderModule Agnostic decoder rejects requested type
[Child 17734: MediaSupervisor #1]: D/PlatformDecoderModule Sandbox RDD decoder rejects requested type
[Child 17734: MediaSupervisor #1]: D/PlatformDecoderModule Sandbox GPU decoder rejects requested type
[Child 17734: MediaPDecoder #1]: D/PlatformDecoderModule Initialising FFmpeg decoder.
[Child 17734: MediaSupervisor #1]: D/PlatformDecoderModule Agnostic decoder rejects requested type
[Child 17734: MediaSupervisor #1]: D/PlatformDecoderModule Sandbox RDD decoder rejects requested type
[Child 17734: MediaPDecoder #2]: D/PlatformDecoderModule Initialising VA-API FFmpeg decoder
[Child 17734: MediaPDecoder #1]: D/PlatformDecoderModule FFmpeg init successful.
[Child 17734: MediaPDecoder #1]: D/PlatformDecoderModule AudioTrimmer[0x7fecec16e420] ::PrepareTrimmers: sample[0,23219] no trimming information
[Child 17734: MediaPDecoder #3]: D/PlatformDecoderModule AudioTrimmer[0x7fecec16e420] ::HandleDecodedResult: sample[0,23219] (decoded[0,23219] no trimming needed

Right after that, the affected tab crashes with Firefox asking me to send a crash report.
inxi -Fxxxza --no-host says:

System:    Kernel: 5.10.5-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
           parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64 root=UUID=345b76c0-f339-4ca7-8582-440f229512a1 ro quiet 
           acpi_enforce_resources=lax "acpi_osi=Windows 2009" loglevel=3 root=UUID=345b76c0-f339-4ca7-8582-440f229512a1 ro 
           resume=UUID=a9353f2a-2cf9-4d4e-ada9-f72d8602045e vga=off nvidia-drm.modeset=1 
           Desktop: Xfce 4.16.0 tk: Gtk 3.24.24 info: xfce4-panel wm: xfwm4 dm: LightDM 1.30.0 Distro: Manjaro Linux 
Machine:   Type: Desktop Mobo: Foxconn model: H67M-S/H67M-V/H67M serial: <filter> BIOS: American Megatrends v: C29F1P03 
           date: 03/15/2013 
CPU:       Info: Dual Core model: Intel Core i3-2105 bits: 64 type: MT MCP arch: Sandy Bridge family: 6 model-id: 2A (42) 
           stepping: 7 microcode: 2F L2 cache: 3 MiB 
           flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 bogomips: 24754 
           Speed: 1795 MHz min/max: 1600/3100 MHz Core speeds (MHz): 1: 1795 2: 2140 3: 1785 4: 1816 
           Vulnerabilities: Type: itlb_multihit status: KVM: VMX unsupported 
           Type: l1tf mitigation: PTE Inversion 
           Type: mds mitigation: Clear CPU buffers; SMT vulnerable 
           Type: meltdown mitigation: PTI 
           Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl and seccomp 
           Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization 
           Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling 
           Type: srbds status: Not affected 
           Type: tsx_async_abort status: Not affected 
Graphics:  Device-1: NVIDIA GF116 [GeForce GTX 550 Ti] vendor: Gigabyte driver: nvidia v: 390.141 
           alternate: nouveau,nvidia_drm bus ID: 01:00.0 chip ID: 10de:1244 
           Display: x11 server: X.Org 1.20.10 compositor: picom v: git-dac85 driver: nvidia display ID: :0.0 screens: 1 
           Screen-1: 0 s-res: 3600x1080 s-dpi: 96 s-size: 953x286mm (37.5x11.3") s-diag: 995mm (39.2") 
           Monitor-1: DVI-I-2 res: 1920x1080 hz: 60 dpi: 82 size: 598x336mm (23.5x13.2") diag: 686mm (27") 
           Monitor-2: DVI-I-3 res: 1680x1050 hz: 60 dpi: 90 size: 474x296mm (18.7x11.7") diag: 559mm (22") 
           OpenGL: renderer: GeForce GTX 550 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 390.141 direct render: Yes 
Audio:     Device-1: Intel 6 Series/C200 Series Family High Definition Audio vendor: Foxconn driver: snd_hda_intel v: kernel 
           bus ID: 00:1b.0 chip ID: 8086:1c20 
           Device-2: NVIDIA GF116 High Definition Audio vendor: Gigabyte driver: snd_hda_intel v: kernel bus ID: 01:00.1 
           chip ID: 10de:0bee 
           Device-3: Creative Live! Cam Chat HD [VF0700] type: USB driver: hid-generic,snd-usb-audio,usbhid,uvcvideo 
           bus ID: 1-1.3:5 chip ID: 041e:4097 serial: <filter> 
           Sound Server: ALSA v: k5.10.5-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Foxconn driver: r8169 v: kernel port: d000 
           bus ID: 03:00.0 chip ID: 10ec:8168 
           IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: AVM Fritz!Card PCI v2.0 ISDN driver: N/A modules: avmfritz port: c000 bus ID: 05:01.0 chip ID: 1244:0e00 
Drives:    Local Storage: total: 1.35 TiB used: 360.5 GiB (26.1%) 
           SMART Message: Unable to run smartctl. Root privileges required. 
           ID-1: /dev/sda maj-min: 8:0 vendor: Intenso model: SSD SATAIII size: 447.13 GiB block size: physical: 512 B 
           logical: 512 B speed: 6.0 Gb/s serial: <filter> rev: 4A0 
           ID-2: /dev/sdb maj-min: 8:16 vendor: Seagate model: ST31000333AS size: 931.51 GiB block size: physical: 512 B 
           logical: 512 B speed: 3.0 Gb/s serial: <filter> rev: CC3H 
Partition: ID-1: / raw size: 438.54 GiB size: 430.65 GiB (98.20%) used: 106.63 GiB (24.8%) fs: ext4 dev: /dev/sda1 
           maj-min: 8:1 
           ID-2: /home raw size: 915 GiB size: 899.64 GiB (98.32%) used: 253.86 GiB (28.2%) fs: ext4 dev: /dev/sdb1 
           maj-min: 8:17 
Swap:      Kernel: swappiness: 60 (default) cache pressure: 100 (default) 
           ID-1: swap-1 type: partition size: 16.51 GiB used: 3.8 MiB (0.0%) priority: -2 dev: /dev/sdb2 maj-min: 8:18 
Sensors:   System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nvidia temp: 56 C 
           Fan Speeds (RPM): N/A gpu: nvidia fan: 60% 
Info:      Processes: 225 Uptime: 20h 16m wakeups: 6 Memory: 7.74 GiB used: 3.08 GiB (39.7%) Init: systemd v: 247 Compilers: 
           gcc: 10.2.0 clang: 11.0.0 Packages: pacman: 1316 lib: 395 Shell: Bash v: 5.1.0 running in: xfce4-terminal 
           inxi: 3.2.01