A recent update seems to have caused CPU usage to go out of control with this extension enabled. I've disabled the extension, and noticed I still have Container tabs functionality, albeit without the extension toolbar button - so I question the need for this extension.

Container tabs have quickly become a must-have feature for me. I have quite a few sites where I actively use multiple accounts (Google, Microsoft, Amazon) and not having to use a separate browser with a completely separate profile and set of addons is great. Even with sites that do allow simultaneous sign-in with different accounts, opening, for example, a work-related link in my work container ensures that it will use my work Google and Microsoft accounts and not accidentally leak/link any personal data.