--- a/toolkit/content/widgets/browser-custom-element.js
+++ b/toolkit/content/widgets/browser-custom-element.js
@@ -1008,30 +1008,16 @@
         this.webNavigation.loadURI(aURI, loadURIOptions)
       );
     }
 
     gotoIndex(aIndex) {
       this._wrapURIChangeCall(() => this.webNavigation.gotoIndex(aIndex));
     }
 
-    /**
-     * Used by session restore to ensure that currentURI is set so
-     * that switch-to-tab works before the tab is fully
-     * restored. This function also invokes onLocationChanged
-     * listeners in tabbrowser.xml.
-     */
-    _setCurrentURI(aURI) {
-      if (this.isRemoteBrowser) {
-        this._remoteWebProgressManager.setCurrentURI(aURI);
-      } else {
-        this.docShell.setCurrentURI(aURI);
-      }
-    }
-
     preserveLayers(preserve) {
       if (!this.isRemoteBrowser) {
         return;
       }
       let { frameLoader } = this;
       if (frameLoader.remoteTab) {
         frameLoader.remoteTab.preserveLayers(preserve);
       }