TCP States DevTools Panel by Libor Benes

Monitor TCP connection states (LISTEN, ESTABLISHED, SYN_SENT, CLOSE_WAIT, LAST_ACK, CLOSED) in in real-time within a Firefox DevTools Panel. Export logs as CSV and view warnings.

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About this extension

• A lightweight Firefox add-on for network engineers and developers.
• View connection details (URL, Method, Status, TCP State) in a table.
• Export logs as CSV and check warnings for stuck connections (e.g., SYN_SENT).
• Includes a state reference and operates offline.
• Prioritizes security with minimal permissions, local processing, and no data collection.
• Access usage instructions over the browser action popup. Supports Firefox 128+.

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