diff --git a/testing/mochitest/BrowserTestUtils/BrowserTestUtils.sys.mjs b/testing/mochitest/BrowserTestUtils/BrowserTestUtils.sys.mjs
index e91adf6a31fc..05c2b513a584 100644
--- a/testing/mochitest/BrowserTestUtils/BrowserTestUtils.sys.mjs
+++ b/testing/mochitest/BrowserTestUtils/BrowserTestUtils.sys.mjs
@@ -933,12 +933,23 @@ export var BrowserTestUtils = {
    * @param {string} uri
    *        The URI to load.
    */
-  loadURI(browser, uri) {
+  loadURIString(browser, uri) {
     browser.loadURI(uri, {
       triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
     });
   },
 
+  /**
+   * Compatibility shim. Should go away Very Soon.
+   * @param {xul:browser} browser
+   *        A xul:browser.
+   * @param {string} uri
+   *        The URI to load.
+   */
+  loadURI(browser, uri) {
+    return this.loadURIString(browser, uri);
+  },
+
   /**
    * Maybe create a preloaded browser and ensure it's finished loading.
    *