Short version: Add all the site permissions that appear in the "Page Info" dialog to Firefox 's settings (about:preferences) and add support for setting the global defaults
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Long version
The "Page Info" dialog has tons of configurable permissions (including, excitingly, "Override keyboard shortcuts", which I learned about today and which inspired this post):
Many of the site permissions that are accessible via the "Page Info" dialog also appear in about:preferences, in the "Privacy & Security" section:
From there, I am able to manage exceptions and block new requests for the listed permissions. But there are lots of permissions that aren't listed here, and the management options for the ones that are listed are a bit limited. My wish list is as follows:
Fingers crossed there aren't deeply esoteric technical limitations that would complicate or impede these features...