// use document listener instead of jQuery because $ is not yet loaded
    document.addEventListener('DOMContentLoaded', () => {
        new Promise((resolve) => {
            $("img").addClass("wm-hide");
            return resolve();
        }).then(function () {
            const elementToObserve = document.body;
            const observer = new MutationObserver((mutations) => {
                mutations.forEach((mutation) => {
                    mutation.addedNodes.forEach((node) => {
                        if ($(node).is("img")) {
                            $(node).addClass("wm-hide");
                        } else {
                            $(node).find("img").addClass("wm-hide");
                        }
                    });
                });
            });

            // Do not observe attributes. This will generate a loop
            observer.observe(elementToObserve, {subtree: true, childList: true});
        });
    });