Tracks work for implementing a new Event Breakpoints panel in the Debugger.

We should make sure that we show anonymous events listeners CC bug 1326816

STR_1:
1. Open url   data:text/html,<script>eval("onclick=function(e){console.log(e)}")</script>
3. Open devtools -> debugger -> events

AR:  No event listeners listed
ER: 'click' event listener should be listed

We should make sure that we show anonymous events listeners CC bug 1326816

Just to avoid any confusion: M1 does not list any event handlers or touch the event bubble in Inspector. M1's panel will only show types of events to pause on – but not active handlers (like the old debugger).

Release Note Request (optional, but appreciated)
[Why is this notable]: Top user feedback
[Affects Firefox for Android]: No
[Suggested wording]: DevTools new Event Listener Breakpoints let you debug which code a page executes in response to browser events. You can pick specific types, such as click or keydown, or whole categories of events, like all mouse input.
[Links (documentation, blog post, etc)]: https://developer.mozilla.org/en-US/docs/Tools/Debugger/Set_event_listener_breakpoints

This is mentioned in the draft notes for 71.