From 243ff210d3677764fabe90897bf3a08742170a2b Mon Sep 17 00:00:00 2001 From: sommerfeld Date: Wed, 13 May 2026 13:43:42 +0100 Subject: feat(firefox): re-enable OpenH264 GMP for MS Teams video LibreWolf disables media.gmp-provider.enabled and media.gmp-gmpopenh264.enabled and falls back to media.webrtc.hw.h264.enabled=true. On Linux this rarely works because Mozilla's bundled FFmpeg doesn't ship H.264 encode support (patent policy), so the SDP offers H.264 but the encoder produces no frames. Result: local camera preview works (raw MediaStreamTrack, no encoding) but remote participants see no video. Affects MS Teams (H.264 primary); does not affect Google Meet (VP8/VP9 native). Same symptom in flatpak and native LibreWolf builds, confirming sandbox is not the cause. arkenfox 2020 deliberately leaves media.gmp-provider.enabled commented out and does not touch the OpenH264 plugin pref. Re-enabling here brings us in line with arkenfox. media.gmp-manager.url is restored from LibreWolf's data:text/plain blank so the OpenH264 GMP can actually download. --- firefox/user-overrides.js | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'firefox') diff --git a/firefox/user-overrides.js b/firefox/user-overrides.js index dfc2abb..6265f95 100644 --- a/firefox/user-overrides.js +++ b/firefox/user-overrides.js @@ -16,6 +16,16 @@ user_pref("extensions.formautofill.heuristics.enabled", false); /** DRM **/ user_pref("browser.eme.ui.enabled", false); // hide DRM UI toggle +/** OpenH264 for WebRTC (MS Teams, any H.264-only conferencing) **/ +// LibreWolf disables the GMP provider and the OpenH264 plugin, and pretends +// media.webrtc.hw.h264.enabled=true covers it. On Linux Mozilla's FFmpeg +// doesn't ship H.264 encode (patent policy), so Teams gets no usable encoder +// and remote participants see no video while local preview works. +// arkenfox 2020 deliberately leaves GMP alone; this aligns with arkenfox. +user_pref("media.gmp-provider.enabled", true); +user_pref("media.gmp-gmpopenh264.enabled", true); +user_pref("media.gmp-manager.url", "https://aus5.mozilla.org/update/3/GMP/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/%CHANNEL%/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml"); + /** Network **/ user_pref("network.dns.disableIPv6", false); // keep IPv6 enabled -- cgit v1.3.1