Implement manifest commands (shortcuts)

Related to #24.

Author: zalmoxisus

src/browser/extension/background/index.js

@@ -1,4 +1,5 @@
 import createDevStore from '../../../app/store/createDevStore.js';
+import openDevToolsWindow from './openWindow';
 import createMenu from './contextMenus';
 import { toContentScript } from './messaging';
 
@@ -9,3 +10,9 @@ const store = createDevStore((action) => {
 createMenu();
 
 window.store = store;
+
+chrome.commands.onCommand.addListener(shortcut => {
+  if (store.liftedStore.isSet()) {
+    openDevToolsWindow(shortcut);
+  }
+});