This extension is excellent if you own multiple accounts for the same service and want to keep things isolated.

For instance, I have a personal GMail account and a work-only GMail account. It's nice to keep these things separate, because then you can use Single-Sign-On authentication without needing to continuously specify which email account I want to use for signing.

You can also associate certain websites with different containers, so that they are always opened in the appropriate container. Very useful as well, though it can lead to problems when you open the same website in two different containers (for example: I use GMail for both work and personal matters).

Sehr nützlich um privates von Geschäftlichem oder Entwicklung von Produktion zu trennen.

This is one of many reasons Firefox will always win over Chromium-based browsers.

I do wish this plugin would shut up about Mozzie VPN though.

One of the best extentions

I access isolated networks/labs via SSH SOCKS proxies. This plugin lets me access a particular lab simply by right-clicking on the new tab button and selecting the lab/network that I want to browse in. I wish there was an option or shortcut key (similar to Ctrl+T or Ctrl+Shift+T) to open a new tab in the same container as the current one, but this is still a huge win.

I've experimented with using it to isolate my personal browsing while on my work computer and while I don't know if my cookies are being separated, I'm pretty sure my browsing history is not. Oh well, it's still great for the first use case! :)

This addons is a must. And it would be better if each "New tab" is different for each container.

Really love this add-on.
But why is there no port to Brave (I don't use G-Chrome) or Vivaldi (yes, I use different browsers for different things, like some crypto wallets do not even have an option for Firefox, etc.), but Firefox is my main driver.