Update prefs.js

Author: MoeClub

Firefox/prefs.js

@@ -112,4 +112,5 @@ user_pref("full-screen-api.macos-native-full-screen", true);
 user_pref("gfx.webrender.all", true);
 user_pref("gfx.webrender.software", false);
 user_pref("accessibility.typeaheadfind.matchesCountLimit", 99999999);
+user_pref("network.http.http3.enable", false);