See https://bugzilla.mozilla.org/show_bug.cgi?id=1682212#c9

Network events are kept both in the pool of the watcher actor, as well as in a Map local to the NetworkEventWatcher.

The pool and map keep increasing everytime you reload the page, even without the "persist logs" option enabled. This means we leak the whole content of the requests after each reload.

We should find a way to cleanup irrelevant requests when navigating.