--- a/caps/BasePrincipal.cpp
+++ b/caps/BasePrincipal.cpp
@@ -331,17 +331,18 @@ BasePrincipal::GetIsInIsolatedMozBrowser
 {
   *aIsInIsolatedMozBrowserElement = IsInIsolatedMozBrowserElement();
   return NS_OK;
 }
 
 nsresult
 BasePrincipal::GetAddonPolicy(nsISupports** aResult)
 {
-  *aResult = AddonPolicy();
+  RefPtr<extensions::WebExtensionPolicy> policy(AddonPolicy());
+  policy.forget(aResult);
   return NS_OK;
 }
 
 extensions::WebExtensionPolicy*
 BasePrincipal::AddonPolicy()
 {
   if (Is<ContentPrincipal>()) {
     return As<ContentPrincipal>()->AddonPolicy();