Event when window.location.href changes

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I use this script in my extension “Grab Any Media” and work fine ( like youtube case )

var oldHref = document.location.href;

window.onload = function() {
    var bodyList = document.querySelector("body")

    var observer = new MutationObserver(function(mutations) {
        mutations.forEach(function(mutation) {
            if (oldHref != document.location.href) {
                oldHref = document.location.href;
                /* Changed ! your code here */
            }
        });
    });
    
    var config = {
        childList: true,
        subtree: true
    };
    
    observer.observe(bodyList, config);
};

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