You can't (as far as I can tell, and I'd love to be wrong!) set add-ons to only activate on certain containers in Firefox. You have to setup separate profiles, which are fully isolated browser contexts and only install extensions you want into each profile.
It's the biggest thing that I like better about Chrome - the profiles are seamless and easy to switch and I can set up different profiles with different extensions.
Containers work "ok" for Firefox for me, but for my biggest use-cases, like splitting work, personal, banking, shopping (e.g. where "Honey" or "Rakuten" are allowed to live) into different contexts with different extensions - Chrome is so much more seamless/effortless.
