diff --git a/firefox.js b/firefox.js
index 8978db1..a30e777 100644
--- a/firefox.js
+++ b/firefox.js
@@ -51,6 +51,9 @@ user_pref("toolkit.cosmeticAnimations.enabled", false);
 // Force enable WebRender
 user_pref("gfx.webrender.all", true);
 
+// Enable AVIF
+user_pref("image.avif.enabled", true);
+
 // Force use of VAAPI, also need Firefox 81 and MOZ_X11_EGL=1
 user_pref("media.ffmpeg.vaapi.enabled", true);
 user_pref("media.ffvpx.enabled", false);