@dalias@hachyderm.io @ricci@discuss.systems I believe containers are baked into Firefox but the addon is an optional "container manager" of sorts that adds features on top of it.

There are alternatives like https://addons.mozilla.org/en-US/firefox/addon/containerise but all of them rely on the built-in container features of the browser itself. (And you don't need them to use containers, they're mostly for convenience)