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When using any of the Firefox images and a random user ID (not the seluser ID in Ubuntu), session creation fails and GeckoDriver responds with "Failed to read marionette port".
Command used to start Selenium Grid with Docker
docker run --user 24397 -d -p 4444:4444 --shm-size="2g" selenium/standalone-firefox:4.15.0-20231122
Relevant log output
Could not start a new session. Response code 500. Message: Failed to read marionette port