To repro:
1. Open http://jsfiddle.net/cvrebert/Lxwc1eah/show/
2. Open the console
3. Click the webpage's checkbox
4. Observe the console output

In Chrome, Safari, and IE11, the output is:
  change
  click
In Firefox only, the output is:
  click
  change

The majority position is that, when the user clicks an <input type="checkbox">, the `change` event gets fired before the `click` event. Firefox does the reverse. The spec currently agrees with Firefox but disagrees with the majority.


Here are the relevant portions of the spec:

https://html.spec.whatwg.org/multipage/interaction.html#run-authentic-click-activation-steps
When a user agent is to [[[run authentic click activation steps]]] for a given event event, it must follow these steps:
    [...]
    6. Dispatch event (the required `click` event) at target.
       If there is an element e and the `click` event is not canceled, [[[run post-click activation steps]]] on element e.

https://html.spec.whatwg.org/multipage/interaction.html#run-post-click-activation-steps
When a user agent is to [[[run post-click activation steps]]] on an element, it must run the [[[activation behaviour]]] defined for that element, if any.

https://html.spec.whatwg.org/multipage/forms.html#checkbox-state-(type=checkbox):activation-behaviour
4.10.5.1.16 Checkbox state (type=checkbox)
    The [[[activation behaviour]]] is to fire a simple event that bubbles named `input` at the element and then fire a simple event that bubbles named `change` at the element.