In order to do a proper clean up of message managers, we could add some kind of listener ID that the parent side could keep track of so when a child side dies the parent could remove the listeners added from that child.

I'd be happy to implement this if someone proposes an easy to use API which doesn't break backwards compatibility. So, ideas are welcome.

So we are probably leaking in the parent when children are killed by the OOM killer? If so that's really bad and we need to fix this as soon as possible.

So we do clear process message managers already. Patch coming to do the same thing for frame message managers.

https://tbpl.mozilla.org/?tree=Try&rev=a7916df4a129 Crossing fingers try looks ok. It should.