whenReady(function () {
    if (!builtInMenu) {
        app.listen(window.thisWindow, 'scriptsLoaded', () => {
            uitools.refreshMenu();
        });
    }

Watching code in maincontent.js and there is rather:

[code]
whenReady(function () {
if (!builtInMenu) {
app.listen(window.thisWindow, 'scriptsLoaded', () => {
uitools.refreshMenu();
});
}
[/code]

So probably the 'scriptsLoaded' event is the event that you are looking for?

Show me whenReady code and what object you've added to app.listen ?

mminit.js:2558 Uncaught Error: addEventListener function not found! Event change
at Object.app.listen (mminit.js:2558:26)

I found in [url=https://www.mediamonkey.com/wiki/Important_Methods_and_Utilities_%28Addons%29#whenReady]this documentation[/url] that I can use window.whenReady(callback) to know when MM and all scripts are loaded, however, I'm trying to attack some app.listener events and I'm getting errors

[code]
mminit.js:2558 Uncaught Error: addEventListener function not found! Event change
at Object.app.listen (mminit.js:2558:26)
[/code]

Is there another event I can hook into to know when it's safe to start setting up my script?

Thanks :)
Dale.