--- a/browser/components/originattributes/test/browser/head.js
+++ b/browser/components/originattributes/test/browser/head.js
@@ -32,18 +32,22 @@ let gFirstPartyBasicPage = TEST_URL_PATH
  *    The url of the page.
  * @param aUserContextId
  *    The user context id for this tab.
  *
  * @return tab     - The tab object of this tab.
  *         browser - The browser object of this tab.
  */
 async function openTabInUserContext(aURL, aUserContextId) {
+  let originAttributes =  {
+    userContextId: aUserContextId
+  };
+  let triggeringPrincipal = Services.scriptSecurityManager.createCodebasePrincipal(makeURI(aURL), originAttributes);
   // Open the tab in the correct userContextId.
-  let tab = BrowserTestUtils.addTab(gBrowser, aURL, {userContextId: aUserContextId});
+  let tab = BrowserTestUtils.addTab(gBrowser, aURL, {userContextId: aUserContextId, triggeringPrincipal});
 
   // Select tab and make sure its browser is focused.
   gBrowser.selectedTab = tab;
   tab.ownerGlobal.focus();
 
   let browser = gBrowser.getBrowserForTab(tab);
   await BrowserTestUtils.browserLoaded(browser);
   return {tab, browser};