The `/browser connect` tip said Chrome 136+ "silently refuse[s] to open the
remote debugging port" on the default user-data-dir and that "there is no error
message". Chrome does surface it: on Chrome 152/macOS, launching the default
profile with --remote-debugging-port puts up an "Allow remote debugging?" dialog,
and the port opens once you press Allow. Port 9222 refusing connections is the
symptom while that consent is pending, not a permanent silent block.
Two details this cost time to rediscover, now written down:
- the consent is asked per launch, so it reappears on every browser restart
- the remote-debugging toggle in chrome://settings does not suppress it; that
toggle only makes the feature available
Also cross-references browser.use_real_profile for the case the tip leaves
unanswered — wanting existing logins in the agent's browser. A dedicated
user-data-dir avoids the dialog but starts signed out; the real-profile snapshot
gets both, since the snapshot copy is itself a non-default user-data-dir.
Verified locally: default profile + --remote-debugging-port=9222 shows the
dialog and leaves 9222 closed, while a --user-data-dir launch answers
/json/version in under a second with no prompt.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
hankookdnt
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