Excellent for keeping accounts separate and from sites tracking you across the web. 2 small caveats: reordering containers doesn't seem to work under the "+" dropdown menu, and syncing to another FF instance doesn't migrate your custom containers. Not looking forward to setting up the additional 27 containers I use in each instance - and I use many...

I use it primarily to have multiple Microsoft and Google accounts running in the same browser window. When used properly, it can also be a great privacy tool (to keep sites from knowing about each other).

An extremely powerful extension that allows you to have multiple accounts for the same service on Firefox. It's a great tool for separating your personal and professional life without having to use more than one browser. It's easy to set up, simple to use, and your containers sync across your Firefox account.

It makes so many things better. Even Twitter. This add-on is the only thing I've found that actually makes Twitter tolerable. That is saying a lot. Easy to use. Customizable. 5/5

we can't put multiple log-in in one container. we must separate the log-in into separate container