I was wondering if the firewall has the ability to decrypt the SSL traffic.
If so, the network admin is able to read the data in clear text at transit.
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SSL/TLS is a protocol providing an end-to-end encrypted communication between two parties each having one of the keys in private/public key pair. Typically a browser and a web server.
In normal circumstances any device between the two endpoints cannot decrypt the communication. That includes firewalls.
It is however possible (and used in organizations) to use a proxy server that decrypts and re-encrypts communication thus allowing interception and decryption (for example for monitoring and filtering). It does however require adding an additional certificate to a trusted certificate store on a client machine (either automatically through a software management system or manually by users).