Use Chrome's `getEventListeners` to list all even listeners added on the player container and child elements.

jwplayer-event-listeners.js

(function(jwplayer) {
    const container = jwplayer().getContainer();
    const elements = Array.prototype.slice.call(container.querySelectorAll('*'))
        .filter(element => element.tagName !== 'path');
    elements.unshift(container);
    
    const listeners = elements.reduce((accumulator, element) => {
        const listenersObj = getEventListeners(element);
        return accumulator.concat(Object.keys(listenersObj).reduce((accumulator2, name) => {
            listenersObj[name].forEach(eventListener => {
                eventListener.element = element;
                accumulator2.push(eventListener);
            });
            return accumulator2;
        }, []));
    }, []);
    
    const callbacks = Object.values(listeners.reduce((accumulator, listener) => {
        const fn = listener.listener;
        const key = `${listener.type}_${fn}`;
        if (!accumulator[key]) {
            accumulator[key] = {
                count: 0,
                type: listener.type,
                name: fn.name,
                fn
            };
        }
        accumulator[key].count++;
        return accumulator;
    }, {}))
        .map(value => value)
        .sort((a, b) => (b.count - a.count) || (parseInt((b.name + b.fn).substr(0, 20), 32) - parseInt((a.name + b.fn).substr(0, 20), 32)))
        .map(listener => [ listener.count, listener.type, listener.name, listener.fn.toString().replace(/\s+/g, ' '), listener.fn ]);
    
    return {
        elements,
        listeners,
        callbacks
    };
}(window.jwplayer));