Disable v3 extension blocklist for 10.0a6
https://bugzilla.mozilla.org/show_bug.cgi?id=1631018 landed and is enabling the v3 extension blocklist mechanism.
We are not sure how this effects our HTTPS-Everywhere extension. So, we disable that mechanism for now.
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information