How to load fingerprinting js asynchronously and get visitor id

Question

I'm using javascript scripting with a legacy version of iMacros (v8.9.7) And I'm a bit confused about getting fingerprinting JS to work properly.

My use case : 1- load fingerprintingJS from CDN asynchronously 2- store the visitorID into variable

My code :

Components.utils.import("resource://gre/modules/Promise.jsm");
Components.utils.import("resource://gre/modules/devtools/Console.jsm");

    function initFingerprintJS() {
        FingerprintJS.load()
        .then(fp => fp.get())
        .then(result => {
            const visitorId = result.visitorId;
            window.console.log(visitorId);
        });
    }

    const loadScript = (src, async = true, type = "text/javascript") => {
        return new Promise((resolve, reject) => {
            try {
                const el = window.document.createElement("script");
                const container = window.document.head || window.document.body;

                el.type = type;
                el.async = async;
                el.src = src;

                el.addEventListener("load", () => {
                    resolve({ status: true });
                });

                el.addEventListener("error", () => {
                    reject({
                        status: false,
                        message: `Failed to load the script ${src}`
                    });
                });

                container.appendChild(el);
            } catch (err) {
                reject(err);
            }
        });
    };

    function get_fingerprint() {

        loadScript("https://cdn.jsdelivr.net/npm/@fingerprintjs/fingerprintjs@3/dist/fp.min.js")
        .then((data) => {
            window.console.log("Script loaded successfully", data);
            initFingerprintJS();
        })
        .catch((err) => {
            window.console.error(err);
        });
    }
    <button onclick="get_fingerprint()">FINGERPRINT</button>

when I remove the two Components imports and run the bit of script in the console, everything works. But when it's from iMacros interface, it generates errors

GET https://cdn.jsdelivr.net/npm/@fingerprintjs/fingerprintjs@3/dist/fp.min.js [HTTP/2.0 200 OK 0 ms] Script loaded successfully Object { status: true } ReferenceError: FingerprintJS is not defined Trace de la pile : initFingerprintJS@resource://gre/modules/RemoteAddonsParent.jsm:1102:5 get_fingerprint/<@resource://gre/modules/RemoteAddonsParent.jsm:1142:9 Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:932:23 this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:813:7 this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:747:11

Any helps please