Not GP but I use containers a lot. I have 3 profiles: default, work, and (OSS project shared accounts). It helps a lot if you have sites that are only-one-container. For example, I never open Google Analytics in my default or OSS container, so that one can get defaulted to my "work" container. For sites that you need to open in multiple containers frequently, it's a bit more cumbersome, but there's secondary addons that you can use to add hotkeys, just search "container hotkeys" or something and pick what you like.

Then beyond that there's just a lot of "reopen this site in...."

Also sometimes I just leave certain tabs open for days at a time that are in the right containers, so that helps a lot too.

So I felt that way for a while then I realized the trick was configuring the Extension Shortcuts for Multi-Account Containers.

I use Ctrl+Alt+J to open up my first container, Ctrl+Alt+H for second container, etc. Once I did that it became very easy to open up a container seamlessly and I started getting more mileage out of containers.

As a disclaimer I also consider it a workflow failure if I have to leave the keyboard to reach for the mouse so YMMV.

I also have mapped CapsLock to Ctrl.

EDIT:

Forgot to mention the containers I have are - Work - Work Test Users - Work Admin Accounts - Personal - School - Professional Social Media - Online Gaming

I have been using containers for a long time. I use temporary containers for most things, so that tracking isn't an issue. If I have an account that is easy to login to (HN, say) I just use a temporary container and login through my password manager. If it is harder to login to, google say, I create a separate permanent container, name it Google, and use that.

Based on the fact that I now have the worst ad suggestions in Facebook of all the people I know (yes, we discuss this subject) I am pretty sure this works.

I would rather recommend you test the profile switching option:

1. Change the shortcut from firefox.exe to "firefox.exe" -ProfileManager

2. Uncheck the "use the selected profile without asking at startup"

3. Create as many profiles you want. And these will be really containerized, not like the simili container tab feature.