We're in the same boat... Still using FF 56 because it doesn't break important add-ons and now this cluster-F. It's disabled most every add-on thereby killing t

We're in the same boat... Still using FF 56 because it doesn't break important add-ons and now this cluster-F. It's disabled most every add-on thereby killing the browser's functionality. Windows 10/FF 56 setting extensions.legacy.enabled, true and xpinstall.signatures.required, false doesn't work but does in Linux Mint 19/FF 66 does. We also added app.update.auto, false to stop Firefox from auto-updating untill they un-F this mess By the way, the "hot-fix" doesn't work for Win10/FF 56 hotfix-update-xpi-intermediate%40mozilla.com-1.0.2-signed.xpi