Navigation in chrome/firefox extension

I’ve been working on my extension YTDownloaderNew, and in the ytm-content-script.js, I’m using this code to detect when the user navigates to a YouTube Music playlist:

navigation.addEventListener('navigate', () => {
    if (window.location.href.includes("music.youtube.com/playlist")) {
        playlistLoaded();
    }
});

It works perfectly fine in Edge and Chrome, but for some reason, it doesn’t seem to work in Firefox. Is there a different event or method I can use for Firefox to achieve the same result?

I tried to intercept the popstate method, but it didn’t really get me anywhere. I also went through the documentation on mozilla website, but I couldn’t find anything useful there.