The idea is great; however, it broke my ability to login using my Google account on other websites, something I do often.

Excellent, Consider it critical to any Firefox install!
The only thing I would add would be the ability to separate the Google container into separate containers again, This way you could isolate Google services from each other, for example YouTube from Google search
I no that the option to ignore selected Google services is available but I would prefer to still contain said service from the rest of my browser.

Thank You containers-everywhere , Love you long time!!

Super!

It works OK... but really, really, *really* needs an option to automatically open Google pages new tabs. Right now, if you click a link that leads to a Google property (mainly, YouTube in my experience) the this plugin basically obliterates all of the tab's history. This means you can't simply click the back button to get back to where you were. You need to hit Ctrl+Shift+T to restore the closed tab, and then close the Google tab manually. Very tedious.

Should have warned before moving out all google sites

It created many duplications for the opened tabs and broked the logged in pages.

I've disabled, uninstalled it, restarted Firefox, but the address bar and tabs still show that the addon is working.

This add on indeed does its job, but it also breaks (some) websites login processes and for some others damages the overall look and display.

Must have addon when using Google services.