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.

it's useless now, please remove this extensions upload old.

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

UPD: thank you.

I am glad they fix the problem and I have been using a lot but the only downside is that it can't be used in private mode. Could you do something about it please?

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!

How is this a Recommended Extension?

Mozilla doesn't have to follow their own rules?

https://support.mozilla.org/en-US/kb/recommended-extensions-program

https://github.com/mozilla/multi-account-containers/issues/1768

https://github.com/mozilla/multi-account-containers/issues/1740

https://github.com/mozilla/multi-account-containers/issues/1691

https://github.com/mozilla/multi-account-containers/issues/572

This problem has existed for so long and apparently no one knows how to fix it.

And now you got the new Ui problem and new glitches, just check the recent reviews. So glad i knew not to update.

It went from being a good extension to something really bad, with just one update

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.

Their latest update made this extension annoying to use. As others have said, now I have to click multiple times to open a new container. I will wait for a few weeks just to see if they read our reviews, but if they don't, I will uninstall it. A shame, because I truly liked this extension.

After latest update hundreds of temporary containers keep on showing up. I can delete them but they are back after a restart. Really crappy update!

don't know what they're doing, it was doing fine and they decided to change everything, we have to click at least 6 times to open a new tab. who came up with this new feature? that guy must be a genius, definitely deserves a raise, what more will he add? i'm excited for the next updates, i hope they add captchas next

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!

deplorable

The latest update completely renders this extension useless. I can't just hit Control-Period and navigate up and down with my arrow keys to select the container I want. Please revert this change or allow switching back. At least make it possible to use the arrow keys to navigate.

Now (version 7.0) it deserves no more than 4 stars. Really bad UX update. People got used to make just one click on container to open a new tab. Now it's 2 clicks... But this is not enough, you also have to move your mouse longer, because container list has moved down. OMG

It use to be 2 clicks to get a container tab, now it takes 3 or sometimes 4 clicks. Click, click, click. Why the change? People don't need a bunch of options every single time they want to open a container.

Really useful extension!

I would give 5 stars if the global hotkey was configurable as ctrl-. conflicts with another extension (which fortunately I'm able to reconfigure)