1927721 - Force a shutdown of Firefox if the Websocket port cannot be aquired after 5s

Status: NEW

(Remote Protocol :: Agent, defect, P2)

Description

[Henrik Skupin [:whimboo][⌚️UTC+2]]

In Marionette, we use a PollPromise to retry the creation of the ServerSocket for 5 seconds to avoid immediate failure if another Firefox process is shutting down and still has the same socket in use. If we can't acquire the requested port, we force a shutdown of Firefox to prevent lingering processes.

Interestingly, we don't apply the same logic for the Remote Agent and its WebSocket port. We should probably introduce similar behavior to prevent Firefox instances from lingering if they can’t be controlled or shut down properly by the client.

This may be the cause of the issue seen with Puppeteer: https://github.com/puppeteer/puppeteer/pull/13245.