background.js

// Copyright (c) 2018 Carol Chen
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the The GNU Affero General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// You should have received a copy of the GNU Affero General Public
// License along with this library; if not, write to the Free Software
// Foundation, 51 Franklin Street, Suite 500 Boston, MA 02110-1335 USA

if (navigator.userAgent.search("Firefox") !== -1) {
    browser.browserAction.onClicked.addListener((tab) => {
        browser.tabs.create({ url: "index.html" });
    });

    browser.runtime.onInstalled.addListener((tab) => {
        browser.tabs.create({ url: "index.html" });
    });
} else {
    chrome.browserAction.onClicked.addListener((tab) => {
        window.open(chrome.runtime.getURL("index.html"));
    });

    chrome.runtime.onInstalled.addListener((tab) => {
        window.open(chrome.runtime.getURL("index.html"));
    });
}