This does not change the fact that container is a core functionality in Firefox.. and for some using addon is a matter of trust.. Also does not change the fact that chrome does not have anything like it..
Additionally Firefix also have profiles as a core funtionality, it already had it before chrome even existed so it had it much longer then chrome had.. But again is mostly hidden away..
You can access it with the command below:
firefox -ProfileManager
But as with containers there are add-ons to make as easy as chrome to switch between profiles.. Although i don't think there is an official one by Mozilla..