it does zoom,
but addon is outdated,
configuration pane has problems with visibility on firefox dark theme,
changing zoom level consumes too much time if many many tabs are open, because it changes the zoom for every tab in background also, which is unnecessary
also github repository has status archived since 2019

primarily used it because addon has lower size than other zoom addons,
so time to change addon

Does the job, but extension text/options is/are unreadable in dark mode.

Also this functionality is now available by default in Firefox 73.

Las páginas no conservan su zoom, menos todavía al aplicar la vista lectura. Tienen que pulirla, así no sirve.

Нафига он нужен? есть встроенный и удобнее.