Breaking JavaScript execution always when cookie is set

Question

Is it possible to break javascript execution in FireBug or in some other web developer tool always when cookie is set (without setting JS breakpoints explicitly)?

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Answer 1

This should work (run it in a console):

origDescriptor = Object.getOwnPropertyDescriptor(HTMLDocument.prototype, 'cookie');
Object.defineProperty(document, 'cookie', {
  get() {
    return origDescriptor.get.call(this);
  },
  set(value) {
    debugger;
    return origDescriptor.set.call(this, value);
  },
  enumerable: true,
  configurable: true
});