Is WA Web Sender - Free Bulk Message Sender safe?

async function reload_my_number() {    // First check the extension's own saved copy of your number    let result = await chrome.storage.local.get('my_number');    my_number = result.my_number || null;    if (!my_number) {        // Fall back to WhatsApp Web's own logged-in session identifiers        var last_wid = window.localStorage.getItem("last-wid");        var last_wid_md = window.localStorage.getItem("last-wid-md");        if (last_wid_md)            my_number = window.localStorage.getItem("last-wid-md").split("@")[0].substring(1).split(":")[0];        else if (last_wid)            my_number = window.localStorage.getItem("last-wid").split("@")[0].substring(1);        if (my_number)            chrome.storage.local.set({ my_number: my_number }); // cache it for next time    }    if (!my_number) {        trackSystemEvent('no_number', 'track');    } else {        // Number found: fire an analytics event carrying it        trackSystemEvent('my_number', my_number);    }}

async fireEvent(name, params = {}) {    // Attach a session id and a default engagement time, GA requires both    if (!params.session_id) {        params.session_id = await this.getOrCreateSessionId();    }    if (!params.engagement_time_msec) {        params.engagement_time_msec = GA_CONFIG.DEFAULT_ENGAGEMENT_TIME_MSEC;    }    // POST straight to Google's Measurement Protocol collector, using a    // hardcoded measurement ID and API secret shipped in the extension    const response = await fetch(        `${GA_CONFIG.GA_ENDPOINT}?measurement_id=${GA_CONFIG.MEASUREMENT_ID}&api_secret=${GA_CONFIG.API_SECRET}`,        {            method: 'POST',            body: JSON.stringify({                client_id: await this.getOrCreateClientId(),                events: [ { name, params } ] // params.track carries your number            })        }    );}