I believe you need to install the add-on compatibility reporter add-on to see the marking (since the add-on modifies the add-on listing). See https://addons.moz

I believe you need to install the add-on compatibility reporter add-on to see the marking (since the add-on modifies the add-on listing). See https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/ https://addons.mozilla.org/en-US/firefox/addon/add-on-compat... .