set opener tab id

src/background/actions/tab.js

@@ -1,5 +1,5 @@
-const openNewTab = (url) => {
-  return browser.tabs.create({ url: url });
+const openNewTab = (url, openerTabId) => {
+  return browser.tabs.create({ url, openerTabId });
 };
 
 const openToTab = (url, tab) => {

src/background/components/background.js

@@ -31,7 +31,7 @@ export default class BackgroundComponent {
     case messages.OPEN_URL:
       if (message.newTab) {
         return this.store.dispatch(
-          tabActions.openNewTab(message.url), sender);
+          tabActions.openNewTab(message.url, sender.tab.id), sender);
       }
       return this.store.dispatch(
         tabActions.openToTab(message.url, sender.tab), sender);