[ipaddr]

Using those containers might be making your firefox experience slower. The very reason you use it might make you think you shouldn't use it for anything else. If you used it without containers I wonder if you would think it's faster. Each container has it's own resources.

How can it be less secure and the browser you choose for privacy reasons only?

[novok]

Multi-account containers are separated cookie/state jars that auto spawn on tabs based on URL rules , they don't need a lot of resources other than maybe kilobytes or a few MB of extra memory per account container. CPU wise and overall memory wise it isn't much.

[bryanrasmussen]

I would say it means that obviously Google wants to track all your personal info but they work really hard and expend a lot resources to be sure it's safe from everyone else, also some attacks are done to not get your info but just to wreck stuff.