web-extension-starter/source/Popup/Popup.tsx

import React from 'react';
import { browser, Tabs } from 'webextension-polyfill-ts';

import './styles.scss';

function openWebPage(url: string): Promise<Tabs.Tab> {
    return browser.tabs.create({ url });
}

const Popup: React.FC = () => {
    return (
        <section id="popup">
            <h2>WEB-EXTENSION-STARTER</h2>
            <button
                id="options__button"
                type="button"
                onClick={(): Promise<Tabs.Tab> => {
                    return openWebPage('options.html');
                }}
            >
                Options Page
            </button>
            <div className="links__holder">
                <ul>
                    <li>
                        <button
                            type="button"
                            onClick={(): Promise<Tabs.Tab> => {
                                return openWebPage('https://github.com/abhijithvijayan/web-extension-starter');
                            }}
                        >
                            GitHub
                        </button>
                    </li>
                    <li>
                        <button
                            type="button"
                            onClick={(): Promise<Tabs.Tab> => {
                                return openWebPage('https://www.buymeacoffee.com/abhijithvijayan');
                            }}
                        >
                            Buy Me A Coffee
                        </button>
                    </li>
                </ul>
            </div>
        </section>
    );
};

export default Popup;