diff --git a/nix/homeModules/common/firefox.nix b/nix/homeModules/common/firefox.nix
index 231eed2d..f282c657 100644
--- a/nix/homeModules/common/firefox.nix
+++ b/nix/homeModules/common/firefox.nix
@@ -79,6 +79,10 @@ in {
         "browser.ml.chat.page" = false;
         "browser.ml.chat.shortcuts" = false;
         "browser.ml.chat.sidebar" = false;
+
+        # Prevent WebRTC leak
+        # https://mullvad.net/en/help/webrtc
+        "media.peerconnection.enabled" = false;
       };
 
       extensions.packages = let