I've been using this since shortly after it was released to separate logins to the same site by different users; for example, when testing a user account while logged in as an administrator. I also use it to log in to Office 365 with different user accounts while supporting multiple clients.
The recent UI change did seem inconvenient (more a matter of interrupting the flow) but seems to have been a necessary compromise to allow additional functions. Instead of left-click, left-click on the icon, it's right-click, left-click on the "Open a new tab..." button. Change is good, humans are capable of learning new ways of doing things without whining.
The new font in the list allows me to see all of my Containers.
One suggestion for a future enhancement would be the ability to sort or manually order my list of containers.

The last update made this plugin sadly a pain to use. Giving this 1 Star till it's fixed.
Update: As someone else mentioned here, there is still a 2 click option by right clicking the default Firefox "+" Tab.
But a reminder for this new feature would have been very useful.

I downgraded to version 6.2.5. New update 7.0.0. it's unusable.

Update: Great! Version 7.0.1. it works. Again 5 stars. Thx.

I know it's first world problems, but three clicks to open a tab? come on, it was perfect before.

UPD: thank you.

Please revert the UI to allow one click for new container tabs. We primarily use containers to log into the same site multiple times on different accounts. No need to look at rarely-used menu options every time we want to open a new tab. Those menu options can't automate the primary use case.
Edit: Thanks for fixing this!

This extension is an absolute necessity for keeping your sessions from getting mixed up. However, the most recent UX update is so laughably bad that I need to find another option. Multiple clicks are now required to perform the most used function of the extension.

Update: thanks for listening to users feedback and fixing the issue.

It seems like the issue with Site Isolation is fixed now. Back to being a great add-on again. (I'm not bothered about clicks like the others since I right-click the New Tab button anyway)

Please please please change the UI back to allowing for opening a new tab in one click.

Edit: Anyone else coming across this - right click (if you can) the regular new tab button in your tabs list and you can do it quickly from there. May be worth making this more obvious to the end user!

It works great. It would be nice if it would come with an out of the box option or a wizard to create containers for the most well know trackers and all the sub/domains associated to it.

As well it would be nice to be able to do some kind of customization per container like "when i close browser, delete all cookies from this specific container" for example.

great work!

In my opinion Multi-Account Containers works perfect!

EU Nao SEI

Great extension!!!