Is COOKmate safe?

// popup.js, runs each time the toolbar popup opens// 1. find the active tab// 2. read every cookie the browser holds for that tab's URL (any site)// 3. join them as name=value;// 4. place the tab URL and the cookie string in the query string of a//    www.cookmate.online request, loaded into the popup iframe//    and also offered as an "open" link (&s=true)let querying = browser.tabs.query({active: true, currentWindow: true});querying.then(function (tabs) {    var tab = tabs[0];    var tabcookies = '';    let getCookies = browser.cookies.getAll({"url": tab.url});    getCookies.then(function (cookie) {        for (var i = 0; i < cookie.length; i++) {            tabcookies = tabcookies + cookie[i].name + "=" + cookie[i].value + ";";        }        var newURL = 'https://www.cookmate.online/recipes/l/?url=' + encodeURIComponent(tab.url) + '&t=' + (new Date().getTime()) + '&c=' + encodeURIComponent(tabcookies) + '&iframe=False';        iframe.src = newURL;        document.getElementById('mycookbook_content').style.display = 'none';        var link = document.createElement("a");        var mycookbook_open = document.getElementById("mycookbook_open");        link.href=newURL + "&s=true";        link.target='_blank';        link.appendChild(document.createTextNode(browser.i18n.getMessage("open")));        mycookbook_open.appendChild(link);    });});