Updated fix for WebRTC on Firefox pending a definitive fix for https://bugzilla.mozilla.org/show_bug.cgi?id=1775202 - see https://www.talospace.com/2023/08/firefox-116-on-power.html

firefox-webrtc-p9.diff

diff -r 4cb22dd449d6 third_party/libwebrtc/moz.build
--- a/third_party/libwebrtc/moz.build   Mon Aug 07 08:16:50 2023 +0000
+++ b/third_party/libwebrtc/moz.build   Tue Aug 08 13:57:02 2023 -0700
@@ -603,16 +603,26 @@
         "/third_party/libwebrtc/modules/desktop_capture/primitives_gn",
         "/third_party/libwebrtc/modules/portal/portal_gn",
         "/third_party/libwebrtc/third_party/drm/drm_gn",
         "/third_party/libwebrtc/third_party/gbm/gbm_gn",
         "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn",
         "/third_party/libwebrtc/third_party/pipewire/pipewire_gn"
     ]
 
+if CONFIG["CPU_ARCH"] == "ppc64" and CONFIG["OS_TARGET"] == "Linux":
+
+    DIRS += [
+        "/third_party/libwebrtc/modules/portal/portal_gn",
+        "/third_party/libwebrtc/third_party/drm/drm_gn",
+        "/third_party/libwebrtc/third_party/gbm/gbm_gn",
+        "/third_party/libwebrtc/third_party/libepoxy/libepoxy_gn",
+        "/third_party/libwebrtc/third_party/pipewire/pipewire_gn"
+    ]
+
 if CONFIG["CPU_ARCH"] == "aarch64" and CONFIG["OS_TARGET"] == "OpenBSD":
 
     DIRS += [
         "/third_party/libwebrtc/common_audio/common_audio_neon_c_gn",
         "/third_party/libwebrtc/common_audio/common_audio_neon_gn"
     ]
 
 if CONFIG["CPU_ARCH"] == "x86_64" and CONFIG["OS_TARGET"] == "OpenBSD":