Is Freezen MateVPN Chrome safe?

chrome.tabs.query({'active': true, 'lastFocusedWindow': true}, function (tabs) {
    var url = tabs[0].url;  // Active tab URL captured here

    var xhr = new XMLHttpRequest();
    // Tab URL appended as query parameter; plain HTTP — no TLS
    xhr.open("GET", "http://api.positionbox.com/?module=Chrome&action=getIPGeoLocation&url=" + url, true);
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4) {
            var resp = JSON.parse(xhr.responseText);
            // Response populates display fields and rewrites button hrefs to ZenMate affiliate URLs
            document.getElementById('js_tab_geolocation_your_ip').innerHTML = resp.positionbox.request.ip;
            document.getElementById('js_btn_your_ip_show_on_map').setAttribute('href', 'https://zenmate.com/?utm_medium=affiliate&utm_source=5134448...');
            document.getElementById('js_tab_website_ip').innerHTML = resp.positionbox.website.ip;
            document.getElementById('js_btn_show_on_map').setAttribute('href', 'https://zenmate.com/?utm_medium=affiliate&utm_source=5134448...');
        }
    };
    xhr.send();
});

// ALL three interactive buttons resolve to the same ZenMate affiliate URL.
// No VPN, proxy, PAC script, webRequest rule, or network tunnel exists anywhere.

// Button 1 ('Check Custom IP') — popup.js:13-31
function init() {
    document.getElementById('js_btn_check_custom_ip').addEventListener('click', function() {
        // Affiliate URL with developer's tracking IDs hardcoded
        var affiliateUrl = 'https://zenmate.com/?utm_medium=affiliate&utm_source=5134448&media_source=CJ_affiliates&AFFILIATE=5134448&cjevent=a2acd7dd761311ed801fb5ca0a18ba74';
        var ip = document.getElementById('js_inp_custom_ip').value;
        if (validateIPaddress(ip)) {
            chrome.tabs.create({ url: affiliateUrl + ip });  // Opens ZenMate, not a VPN
        }
    });
}

// Buttons 2 ('Hide My IP') and 3 ('Get Free VPN') — popup.js:45-48
// Set to the same affiliate URL after the geolocation XHR completes
document.getElementById('js_btn_your_ip_show_on_map').setAttribute('href', affiliateUrl);
document.getElementById('js_btn_show_on_map').setAttribute('href', affiliateUrl);