javascript:(function() {
let url;
// Add frame to ensure we have access to `prompt`
let iframe = document.createElement('iframe');
document.body.appendChild(iframe);
// Request data
if (url = iframe.contentWindow.prompt('Enter script URL. Type "module" if you want loaded as a module.')) {
var type = url.match(/\s?module\s?/) ? 'module' : 'text/javascript';
url = url.replace(/\s?module\s?/, '');
var x = document.createElement('script');
if (url.toLowerCase().substr(0, 4) === 'http') {
x.setAttribute('src', url);
} else {
x.innerHTML = url;
}
x.setAttribute('type', type);
document.querySelector('head').appendChild(x);
}
// Remove
document.body.removeChild(iframe);
})();
If you create a bookmark with this code in it, it'll allow you to inject a script URL into the head of the page you're viewing.
It creates a temporary iframe just incase the top window overrides the prompt(...) command to prevent you from doing this.
There are some instances where the CSP of a page will prevent you from doing this, but it still works in many cases.
When it prompts you, you can give it responses like:
http://localhost:8080/script/my-script.js
// adds <script src="http://localhost:8080/script/my-script.js" type="text/javascript"></script>
or
http://localhost:8080/script/my-script.js module
// adds <script src="http://localhost:8080/script/my-script.js" type="module"></script>
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