All credit goes to @renniepak for the original bookmarklet https://twitter.com/renniepak/status/1602620834463588352

js_endpoints_new_tab.js

javascript: (function() {
    var scripts = document.getElementsByTagName("script"),
        regex = /(?<=(\"|\%27|\`))\/[a-zA-Z0-9_?&=\/\-\#\.]*(?=(\"|\'|\%60))/g;
    const results = new Set;
    for (var i = 0; i < scripts.length; i++) {
        var t = scripts[i].src;
        "" != t && fetch(t).then(function(t) {
            return t.text()
        }).then(function(t) {
            var e = t.matchAll(regex);
            for (let r of e) results.add(r[0])
        }).catch(function(t) {
            console.log("An error occurred: ", t)
        })
    }
    var pageContent = document.documentElement.outerHTML,
        matches = pageContent.matchAll(regex);
    for (const match of matches) results.add(match[0]);

    function writeResults() {
        var newTab = window.open("", "_blank");
        if (newTab) {
            results.forEach(function(t) {
                newTab.document.write(t + "<br>");
            });
            newTab.document.close();
        } else {
            results.forEach(function(t) {
              document.write(t + "<br>");
            })
        }
    }
    setTimeout(writeResults, 3e3);
})();