I use multi-account containers, but the home button won't use them when I assign multiple URLs for my home page. Will an extension be better?

How can I open Firefox and get my multiple email accounts to open in their respective multi-account containers (I love the containers btw). Should I be using an add-on or extension that I haven't discovered yet? I've tried assigning the webpages URLs within the home page options, but it doesn't do it right...Suggestions?