I'm reading a post on Mozilla's site on "making it more secure" and I'm just saying you shouldn't do that.
If you are giving a LLM capabilities that could lead to a security incident, then that is on you, and you shouldn't do that.
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Or to put it another way, speaking as someone with some security knowledge, and who has found security vulnerabilities in software, this sounds a lot like putting your hand on a flame.
Sometimes, it is better to keep it simple, rather than over-complicating it. Sometimes, a bit of complexity does add to the security (i.e. end-to-end encryption), but other times, it just makes it harder to verify.