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.
Niqaya' q'ij chuqa' niqaya' kitzijol ri taq k'exoj, xa xe man tikirel ta nik'ex. Toq ri okisaxela' kiyakon chik ri WebExtension, man xketikïr ta xtikiyäk jun rutz'aqat choltz'ib'anem.