This is an excellent concept. I'm not so bothered about separating sites by category but containerising individual known bad organisations so that they cannot access anyone else's cookies is fantastic. However, I've only awarded 4-stars due to 1. low number and range of container colours available, 2. No ability to pre-assign sites by direct url entry - for some reason you have to open them first and then assign them then assign them from the drop down, 3. No ability to assign sites by domain - you have to open each site then assign them individually which is both laborious and prone to error.

I would rate it higher if there was more advanced features to customize. It's too bare bones as is.

A extensão é ótima. Além de melhorar nossa privacidade ela me deixou mais produtivo (por não ter que ficar trocando a conta do e-mail sempre que for acessar uma conta diferente).

Helps you separate accounts and groups of accounts, even allows you to always open a site in a specific container

This is the main reason why I still use Firefox! Works perfectly (especially if you have to login to multiple O365 accounts, which can be brutal)

On Linux, the extension icon doesn't follow the GTK theme.

Addendum 2: So, I got a new computer and I used this extensions sync feature. Regrettably, in the process of doing so my site lists for my containers were nuked. This has caused more headache for me than the privacy benefits are worth.

I'm finally uninstalling this extension.

Addendum: I didn't realize briefly turning this extension off would wipe out all my containers and settings for this extension. I turned it off for a bit since my Dad might need to use my browser for a bit and I didn't want him to be hassled by my extensions. So, I wish there had been a warning about this or a way to backup my containers and settings I've created over the past few months.

Original Review: Something I never knew I needed. Lots of user-friendly options such as being able to set a website to only ever be opened in one container. This means I don't have to first open a tab in that specific container then go to that website. Also, it's handy in preventing every social media in existence from tracking me since I've put each of them in their own container. Thank you Mozilla!

Love this add-on. It's been great with my work to keep certain sites separated from each other. I use multiple Office 365 accounts a lot for example and using these helps with the admin login persistence issues. Also helps isolate junk sites that could be intrusive.