This is going to be an annoying change me since I use the 1Password extension which isn't signed as far as I know. So, it's likely I'll switch over to Chrome (which I've had performance issues with in the past) or Pale Moon. Seriously, it's my browser. It's fine if you want to make users white list extensions but to completely block unsigned extensions is a bit over zealous. Unless Mozilla makes the signing process automatic (since it seems some extensions on addons.mozilla.org can go months before being updated to the current version) I don't see this working out at all.
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