Disable connectivity checks

user.js

@@ -10,6 +10,11 @@ user_pref("identity.fxaccounts.remote.root", "");
 user_pref("identity.fxaccounts.service.monitorLoginUrl", "");
 user_pref("identity.fxaccounts.toolbar.enabled", false);
 
+// Connectivity
+user_pref("captivedetect.canonicalURL", "");
+user_pref("network.captive-portal-service.enabled", false);
+user_pref("network.connectivity-service.enabled", false);
+
 // Crash reporter
 user_pref("breakpad.reportURL", "");
 user_pref("browser.crashReports.onDemand", false);