diff --git a/content/base/src/nsFrameLoader.cpp b/content/base/src/nsFrameLoader.cpp
index 5b08d7d3b9c..839dc7e1c63 100644
--- a/content/base/src/nsFrameLoader.cpp
+++ b/content/base/src/nsFrameLoader.cpp
@@ -318,6 +318,15 @@ nsFrameLoader::LoadFrame()
   src.Trim(" \t\n\r");
 
   if (src.IsEmpty()) {
+    // If the frame is a XUL element and has the attribute 'nodefaultsrc=true'
+    // then we will not use 'about:blank' as fallback but return early without
+    // starting a load if no 'src' attribute is given (or it's empty).
+    if (mOwnerContent->IsXUL() &&
+        mOwnerContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::nodefaultsrc,
+                                   nsGkAtoms::_true, eCaseMatters)) {
+      return NS_OK;
+    }
+
     src.AssignLiteral("about:blank");
   }
 
diff --git a/content/base/src/nsGkAtomList.h b/content/base/src/nsGkAtomList.h
index 0a402ba5ad5..25163f81d1d 100644
--- a/content/base/src/nsGkAtomList.h
+++ b/content/base/src/nsGkAtomList.h
@@ -607,6 +607,7 @@ GK_ATOM(no, "no")
 GK_ATOM(noautohide, "noautohide")
 GK_ATOM(nobr, "nobr")
 GK_ATOM(node, "node")
+GK_ATOM(nodefaultsrc, "nodefaultsrc")
 GK_ATOM(nodeSet, "node-set")
 GK_ATOM(noembed, "noembed")
 GK_ATOM(noframes, "noframes")