Ben says that it lives in the AsyncConnectionHelper and is 30 seconds long. This seems like a source of random failures, and isn't something that's in the spec.
Created attachment 572856 [details] [diff] [review] Patch, v1
6 years ago
https://hg.mozilla.org/mozilla-central/rev/e0add41f9a8f PS: you can avoid the [inbound] in the whiteboard if you wish, we don't use it anymore.