a bit finicky to set up

I use it primarily to have multiple Microsoft and Google accounts running in the same browser window. When used properly, it can also be a great privacy tool (to keep sites from knowing about each other).

An extremely powerful extension that allows you to have multiple accounts for the same service on Firefox. It's a great tool for separating your personal and professional life without having to use more than one browser. It's easy to set up, simple to use, and your containers sync across your Firefox account.

actually it's useless in cloud. i can't open spotify in container in any other device when it's saying there's cloud sync.

It makes so many things better. Even Twitter. This add-on is the only thing I've found that actually makes Twitter tolerable. That is saying a lot. Easy to use. Customizable. 5/5

打开多个容器标签后，CPU和硬盘使用率会升高，CPU会占用50%，硬盘会一直有20Mb/s的写入，但并不会占用实际空间。