Remove stray comment in Popup

Author: aeksco

src/popup/component.tsx

@@ -52,8 +52,6 @@ function executeScript(position: number): void {
 export function Popup() {
     // Sends the `popupMounted` event
     React.useEffect(() => {
-        // NOTE - we use conditional chaining on `browser`import
-        // because it doesn't load up in Storybook
         browser.runtime.sendMessage({ popupMounted: true });
     }, []);