@Chris H Currently it is not possible to add your own IDPS to Azure Firewall. Is there a reason you would want to do this? There are 58k rules in over 50 categories and around 40 rules are added each day. I would also encourage you to please look into the existing IDPS signatures to verify and determine if that meets your needs.
Please let us know if you have any further questions and we will be glad to assist you further. Thank you!
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