We allow and encourage an upgrade but you cannot reverse this process. Once your users have the WebExtension installed, they will not be able to install a legacy add-on.
Nessirig udiɣ nettmuddu tabɣest n lqem-a, maca ticki yemmed, ulac tuɣalin ɣer deffir. Ticki iseqdace-ik sbedden WebExtension, ur ttizmiren ara ad sbedden izegrar iqbuṛen.