diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 6e4cff6092..535ca1c93b 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -21,13 +21,15 @@
 
 pref("keyword.enabled", false);
 pref("general.useragent.locale", "chrome://global/locale/intl.properties");
+
+// Platform User-agent compatibility mode default settings
 pref("general.useragent.compatMode.gecko", false);
 pref("general.useragent.compatMode.firefox", false);
-pref("general.useragent.compatMode.version", "68.0");
+pref("general.useragent.compatMode.version", "102.0");
 pref("general.useragent.appVersionIsBuildID", false);
 
-// This pref exists only for testing purposes. In order to disable all
-// overrides by default, don't initialize UserAgentOverrides.jsm.
+// In order to disable all overrides by default, don't initialize
+// UserAgentOverrides.jsm.
 pref("general.useragent.site_specific_overrides", true);
 
 pref("general.config.obscure_value", 13); // for MCD .cfg files