popup_menu.js

document.addEventListener('DOMContentLoaded', () => {

    let menu_elements = document.getElementsByClassName('message-on-click');
    for (let i = 0; i < menu_elements.length; i++) {
        let element = menu_elements[i];
        element.addEventListener('click', () => {
            browser.runtime.sendMessage({event: element.id});
            window.close();
        });
    }

    document.getElementById('menu-preferences').addEventListener('click', () => {
        browser.runtime.openOptionsPage();
        window.close();
    });

    let links = document.getElementsByTagName('a');
    for (let i = 0; i < links.length; i++) {
        links[i].addEventListener('click', event => {
            event.preventDefault();
            event.target.blur();
        })
        links[i].parentElement.addEventListener('click', () => {
            browser.tabs.create({url: links[i].href});
            window.close();
        });
    }

});