https://hg.mozilla.org/mozilla-central/file/tip/browser/app/...
The expansion from "we block malicious add-on versions" to "we block add-ons with known stability or security issues" to "we err on the side of security" does not bode well for the future of hacking cool add-ons.
https://hg.mozilla.org/mozilla-central/file/tip/browser/app/...