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Disable the "leave page?" confirmation

Blocks the annoying dialog that holds you back when closing or leaving a tab.

Code to copy

window.addEventListener('beforeunload', function (e) {
  e.stopImmediatePropagation();
}, true);
try {
  window.onbeforeunload = null;
  Object.defineProperty(window, 'onbeforeunload', {
    get: function () { return null; },
    set: function () {},
    configurable: true
  });
} catch (e) {}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's JavaScript panel and save — it runs on every page visit.