diff --git a/image/imgLoader.cpp b/image/imgLoader.cpp
index dba4d9f140d..41ece8f52d5 100644
--- a/image/imgLoader.cpp
+++ b/image/imgLoader.cpp
@@ -928,12 +928,14 @@ static nsresult NewImageChannel(
   } else {
     // either we are loading something inside a document, in which case
     // we should always have a requestingNode, or we are loading something
-    // outside a document, in which case the triggeringPrincipal and
-    // triggeringPrincipal should always be the systemPrincipal.
-    // However, there are exceptions: one is Notifications which create a
-    // channel in the parent process in which case we can't get a
-    // requestingNode.
-    rv = NS_NewChannel(aResult, aURI, nsContentUtils::GetSystemPrincipal(),
+    // outside a document, in which case the triggeringPrincipal should be the
+    // systemPrincipal. However, there are exceptions: one is Notifications
+    // which create a channel in the parent process in which case we can't get a
+    // requestingNode though we might have a valid triggeringPrincipal.
+    rv = NS_NewChannel(aResult, aURI,
+                       aTriggeringPrincipal
+                           ? aTriggeringPrincipal
+                           : nsContentUtils::GetSystemPrincipal(),
                        securityFlags, aPolicyType,
                        nullptr,  // nsICookieJarSettings
                        nullptr,  // PerformanceStorage