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For the WEB CLI, port 5555 could be changed to a different port from advanced settings on a supported version.
Just for testing, maybe changing the port will resolve the error on Firefox?
See here:
Connections to Port 5555 Fail on Quantum Spark Devices
https://support.checkpoint.com/results/sk/sk183637
I'm not sure if changing the port to 22 will work with the current design though.
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