diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 128130349a..039b6ceea9 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -27,6 +27,7 @@ pref("general.useragent.compatMode.gecko", false);
 pref("general.useragent.compatMode.firefox", false);
 pref("general.useragent.compatMode.version", "102.0");
 pref("general.useragent.appVersionIsBuildID", false);
+pref("general.useragent.change_platform_version", true);
 
 // In order to disable all overrides by default, don't initialize
 // UserAgentOverrides.jsm.