--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -812,17 +812,17 @@ ContentChild::ProvideWindowCommon(TabChi
     float fullZoom;
     nsCOMPtr<nsIPrincipal> triggeringPrincipal;
     rv = GetWindowParamsFromParent(aParent, baseURIString, &fullZoom,
                                    getter_AddRefs(triggeringPrincipal));
     if (NS_WARN_IF(NS_FAILED(rv))) {
       return rv;
     }
 
-    URIParams uriToLoad;
+    OptionalURIParams uriToLoad;
     SerializeURI(aURI, uriToLoad);
     Unused << SendCreateWindowInDifferentProcess(aTabOpener,
                                                  aChromeFlags,
                                                  aCalledFromJS,
                                                  aPositionSpecified,
                                                  aSizeSpecified,
                                                  uriToLoad,
                                                  features,

--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -4824,17 +4824,17 @@ ContentParent::RecvCreateWindow(PBrowser
 
 mozilla::ipc::IPCResult
 ContentParent::RecvCreateWindowInDifferentProcess(
   PBrowserParent* aThisTab,
   const uint32_t& aChromeFlags,
   const bool& aCalledFromJS,
   const bool& aPositionSpecified,
   const bool& aSizeSpecified,
-  const URIParams& aURIToLoad,
+  const OptionalURIParams& aURIToLoad,
   const nsCString& aFeatures,
   const nsCString& aBaseURI,
   const float& aFullZoom,
   const nsString& aName,
   const IPC::Principal& aTriggeringPrincipal)
 {
   nsCOMPtr<nsITabParent> newRemoteTab;
   bool windowIsNew;

--- a/dom/ipc/ContentParent.h
+++ b/dom/ipc/ContentParent.h
@@ -536,17 +536,17 @@ public:
                    CreateWindowResolver&& aResolve) override;
 
   virtual mozilla::ipc::IPCResult RecvCreateWindowInDifferentProcess(
     PBrowserParent* aThisTab,
     const uint32_t& aChromeFlags,
     const bool& aCalledFromJS,
     const bool& aPositionSpecified,
     const bool& aSizeSpecified,
-    const URIParams& aURIToLoad,
+    const OptionalURIParams& aURIToLoad,
     const nsCString& aFeatures,
     const nsCString& aBaseURI,
     const float& aFullZoom,
     const nsString& aName,
     const IPC::Principal& aTriggeringPrincipal) override;
 
   static bool AllocateLayerTreeId(TabParent* aTabParent, uint64_t* aId);
 

--- a/dom/ipc/PContent.ipdl
+++ b/dom/ipc/PContent.ipdl
@@ -1026,17 +1026,17 @@ parent:
         returns (CreatedWindowInfo window);
 
     async CreateWindowInDifferentProcess(
       PBrowser aThisTab,
       uint32_t aChromeFlags,
       bool aCalledFromJS,
       bool aPositionSpecified,
       bool aSizeSpecified,
-      URIParams aURIToLoad,
+      OptionalURIParams aURIToLoad,
       nsCString aFeatures,
       nsCString aBaseURI,
       float aFullZoom,
       nsString aName,
       Principal aTriggeringPrincipal);
 
     sync GetAndroidSystemInfo()
         returns (AndroidSystemInfo info);

--- a/dom/tests/browser/browser.ini
+++ b/dom/tests/browser/browser.ini
@@ -72,8 +72,9 @@ support-files =
 support-files =
   prerender.html
   prerender_target.html
 skip-if = true || !e10s # Prerendering requires e10s, turned off for e10s-multi Bug 1315042
 [browser_noopener.js]
 support-files =
   test_noopener_source.html
   test_noopener_target.html
+[browser_noopener_null_uri.js]

new file mode 100644
--- /dev/null
+++ b/dom/tests/browser/browser_noopener_null_uri.js
@@ -0,0 +1,12 @@
+add_task(async function browserNoopenerNullUri() {
+  await BrowserTestUtils.withNewTab({gBrowser}, async function(aBrowser) {
+    let waitFor = BrowserTestUtils.waitForNewWindow();
+    await ContentTask.spawn(aBrowser, null, async () => {
+      ok(!content.window.open(undefined, undefined, 'noopener'),
+         "window.open should return null");
+    });
+    let win = await waitFor;
+    ok(win, "We successfully opened a new window in the content process!");
+    await BrowserTestUtils.closeWindow(win);
+  });
+});