diff --git a/data/connectivity-check b/data/connectivity-check
index 77e02b9e..42cdcaf3 100644
--- a/data/connectivity-check
+++ b/data/connectivity-check
@@ -15,6 +15,7 @@ network-test.debian.org
 
 # Firefox
 detectportal.firefox.com
+firefox-portal-detection.com
 
 # GNOME
 full:nmcheck.gnome.org
diff --git a/data/firefox b/data/firefox
index df07de09..a40ee8a2 100644
--- a/data/firefox
+++ b/data/firefox
@@ -1,4 +1,5 @@
 extendfirefox.com
+firefox-portal-detection.com
 firefox.com
 firefox.hu
 firefoxtweetmachine.com