Add Firefox versions for api.Window.[copy/cut/paste]_event (#13051)
Add Firefox versions for api.Window.[copy/cut/paste]_event (#13051)

This PR adds real values for Firefox and Firefox Android for the clipboard event members of the `Window` API, based upon manual testing.

Test Code Used:
```html
<div id="test">
	<input value="Copy/cut/paste me!" />
</div>

<script>
	window.addEventListener('copy', function() {
		alert("Copy!");
	});
	window.addEventListener('cut', function() {
		alert("Cut!");
	});
	window.addEventListener('paste', function() {
		alert("Paste!");
	});
</script>
```
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data