This is a must have and one of the main reasons I keep using Firefox.
My only concern is that is has not been updated in a while, but other than that, it works great.

Very nice extension, does exactly what it says, perfect for development.

Wow, what a very well made extension with great customization options!

First of all it does exactly what is says on the tin!

And second, it has a huge amount of options. Like you can even choose a random color each time a temporary container opens *and* you can exclude colors that you already use with some other container! That is awesome.

Easy to use. Does a wonderful job.

This is a useful addon. Sadly, the developer passed away on January 2023, so there is no further updates. You can view the github page to read more about the future of this project (issue#618).

This is so useful for web developers, makes me glad I'm using Firefox. Unlike Chrome's private browsing, every time you click that icon, the new tab has a brand new "cookie jar" so you can be logged into any app with multiple accounts on multiple tabs making debugging a breeze. Also for normal multi-account use.

Ok

WARNING: This addon is no longer maintained! The developer passed away and there is no fork currently.

Awesome use of Firefox`s containers. If you want to use two logins on one site or dont trust a site, this feature makes Firefox`s container isolation very easy to use!

This fixes the official Multi-Account container extension's main weakness.

You can use this extension's "Isolation" setting so than when you click on a result in a search engine, for example, it automatically loads the new site in a temporary container instead of loading in the search engine's container.

Now Google can't follow you to the sites you open through its search results.

Edit: It seems the creator passed away in 2023. RIP, and thank you for the great extension.