diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index e297fad99892..f1f276128cb0 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -580,6 +580,10 @@ pref("media.autoplay.default", 1); // 0=Allowed, 1=Blocked
 // Enable WebSpeech speech synthesis
 pref("media.webspeech.synth.enabled", true);
 
+// OpenH264 is visible in about:plugins, and enabled, by default.
+pref("media.gmp-gmpopenh264.visible", true);
+pref("media.gmp-gmpopenh264.enabled", true);
+
 // optimize images memory usage
 pref("image.downscale-during-decode.enabled", true);