diff --git a/src/background/main.background.ts b/src/background/main.background.ts
index 5b4d9e563c..9cc65a56a7 100644
--- a/src/background/main.background.ts
+++ b/src/background/main.background.ts
@@ -75,7 +75,7 @@ export default class MainBackground {
 
         // Other fields
         this.sidebarAction = (typeof opr !== 'undefined') && opr.sidebarAction ?
-            opr.sidebarAction : chrome.sidebarAction;
+            opr.sidebarAction : (window as any).chrome.sidebarAction;
     }
 
     private async buildContextMenu() {