It's great, but subdomains are still an issue, you basically must use 3rd party addons like Containerise if you want to manually add the URLs / use regex to make containers for specific subdomains, because that's not an option here.

呃…找不到此网站。

我们无法连接至 xn--addons-2x8i375agjh1tz.mozilla.org 的服务器。

如果确定此网址正确，您可以尝试：

过会儿再重试。
检查您的网络连接是否正常。
如果您部署有网络防火墙，请检查 Firefox 是否已被授权访问网络。

This need a better way to add sites to containers.

Very nice, BUT missing essentials: container preferences sync + container reordering. Moreover, mobile support + temporary containers could be a much desired addition.

So cool :)
This allows me to "box" all google websites in its own container and all Amazon websites in another.
Plus, I can have as many containers as I want, in case I want to log into something with different accounts at the same time.

The importance of a browser extension like this can not be overstated. The fact that Mozilla them self maintain it makes me feel warm inside. Much privacy very container!

Usability changes/default selected container type when opening the popup/shortcuts to open container

It's awesome, but why can't we change the order of the containers in the containers list? That UI feature should be a no-brainer...

best add-on ever created

Very useful. I'm using multiple accounts on for the same site and with this extension I don't have to deal with multiple browsers and incognito mode.

This is one of the most amazing feature of Firefox, at work we use the GSuite and Chrome with multiple accounts: this add-on allows me to ditch Chrome entirely.
I am also converting other colleagues to it, little by little.
I am an IT Technician at Salesforce :)