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 uleqqem-agi, acukan ulac tuɣalin ar deffir. Ticki iseqdacen sbedden WebExtension, ur ttizmiren ara ad sbedden ileman iqburen.