1 files changed, 22 insertions, 0 deletions
diff --git a/docshell/test/browser/browser_bug388121-1.js b/docshell/test/browser/browser_bug388121-1.js
new file mode 100644
index 0000000000..07c476f11b
--- /dev/null
+++ b/docshell/test/browser/browser_bug388121-1.js
@@ -0,0 +1,22 @@
+add_task(async function test() {
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: "about:blank" },
+    async function (newBrowser) {
+      await SpecialPowers.spawn(newBrowser, [], async function () {
+        var prin = content.document.nodePrincipal;
+        Assert.notEqual(prin, null, "Loaded principal must not be null");
+        Assert.notEqual(
+          prin,
+          undefined,
+          "Loaded principal must not be undefined"
+        );
+
+        Assert.equal(
+          prin.isSystemPrincipal,
+          false,
+          "Loaded principal must not be system"
+        );
+      });
+    }
+  );
+});