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THIS WONT WORK (THE EASY WAY):
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Misleading quote: "Avoid leaving social-network footprints all over the web (for example, you could use a Container tab for signing in to a social network, and use a different tab for visiting online news sites, keeping your social identity separate from tracking scripts on news sites)."

You'll need to add an option to change its behavior. When opening a site in a container (e.g. Bing-search) - clicking a link - the new (unassigned) site will stay in the same container thus enabling tracking. Pretty useless this way. Although useful for using different profiles, it's not secure/private.

Options to add (user-decided behavior):
- Open new unassigned sites in the default container, a temporary container or current container (you can reassign later)
- Switch/assign (via toolbar button) the current site to different container (assign/move/copy to a new container for site)
- Changing to a new container will open a new tab or use the current tab (a new tab to avoid losing *cursing* history)
- Option to open web sites in their own containers without the user assigning a container (auto-created for TLD's) *
- Possibility to select a default container for a site assigned to multiple containers or use last container used
- Possibility to sort container labels
- Add an overview of which site/data is contained in which container
- Try to also use the omni-box for extra functions (assigned container switching) since the container-label is already there

* When reassigned by user the auto-created container is renamed or merged with an existing container

EDIT 1: Rating lowered from 2 to 1 star until problems are solved. Totally wrong implementation (the omni-box becoming useless and is imprisoned by this add-on). I get the idea but it's wrong. Visiting Facebook, then entering a different URL, will keep you in the Facebook container. Track-track-track. Just too much concentration and handling is needed to keep things real secure. For now this extension is just a kind of identity switcher within the same Firefox user-profile. Why not then just create an add-on to switch to another user-profile with a toolbar drop down-menu? At least that's clear and transparent. This surely isn't! For this to work properly you've to create a container for every URL/cluster of sites you visit. We need Firefox Web Clusters/Containers.

EDIT 2: Found out that sites are currently not even linked to containers (only cache/cookie data) which was not my assumption. It starts your selected container and stores data in that container separating data from other containers. The problem here is that selecting a default container for a specific site results in not being able to switch accounts for that specific site. A contradicting (dis)function.

Abstract/Résumé:
- You can switch profiles by selecting containers in the toolbar-button (entering the URL again)
- Ones assigned to a specific default container, you can't switch profiles
- You'll need to be careful entering websites you're not willing to have in the container since this enables tracking *
- To protect you from tracking you'll need (an) extension(s) that isolates Facebook, etc. from all other containers **

* You'll notice you're logged off from web sites (don't log in but start a new container). This extension is (not) for dummies.
** There's a Facebook container that doesn't work i.c.w. other forks (Google, Twitter, etc.). Also you can't switch profiles.

EDIT 3: For a workable solution install these extra add-ons

- Switch Container (https://addons.mozilla.org/en-US/firefox/addon/switch-container/)

- Temporary Containers (https://addons.mozilla.org/en-US/firefox/addon/temporary-containers/)

Moz://FifthAxiom

Using FF 72.0 & Multi-Account Containers 6.1.1 it lasted for about 15 mins then broke. I cleared all my history including the cache and after that container assignment in the URL tab disappeared forever. It previously appeared using a mouse right click on the tab. Tried bouncing everything and reinstalling it...still dead. I can manage the containers but putting a tab in one is gone. Finally got it working by completely reseting FF and reinstalling it along with my other add-ons.

no possibility to sync with other instances of firefox. Its useless this way. The whole syncing makes for me only sense because I can use the browser at home and at work, but i dont want to mix the contents. Because Firefox does not support multiple profiles, or does not have a user friendly support for profiles, the multi-account-containers would be a good workaround, but if you cannot sync containers, this addon its useless.

Different accounts use the same URL for the same website. There's no way to use this for multiple accounts unless the different accounts had different URL's. Or there need to be better instructions.

Annoying

How many goddamn times do I have to "Get Started"????

This need a better way to add sites to containers.

Does not work with Waterfox

Si ce n'est pas simple d'utilisation et de compréhension, c'est que c'est inutile. Et ça m'a obligé à modifier mon mot de passe Facebook. De quoi m'agacer...

Was great untill today, when I have lost my container tab and all my set continers are not showing when opeing a tab

no me guarda para las sesiones siguientes las paginas catalogadas para cada contenedor

J'ouvre pas une nouvelle page avec Facebook ou Google avant de faire quoi que ce soit quand je surf, je suis le seul à cliquer droit dans un nouvel onglet ou encore à utiliser des marques pages? En 3 jours, pas un container... une fonction pour placer le conteneur après que la page soit ouverte aurait pu être bien...

It has worked for a short time, you could create tabs with their own container, and it just stopped working, it stopped creating tabs all together. I do not recommend, it is unreliable.

Cannot inherit container from last usage.

It is a nice idea. Unfortunately it does NOT work. If I sign into gmail in my "Personal" container, the session extends to all other containers. If I open youtube in its own container, I'll be already logged in my Google account. If I log out, it'll log me out from all containers.

This is one of the greatest Firefox extensions. But the fact is has no way to sync between browsers/pc's or export/import settings, makes it completely worthless.

Containers was GREAT until it vanished. The icon disappeared and I can't see how to get it back. So, it looks like Firefox gave me an update on July 1 and it loused up Containers. PLEASE REPAIR THE DAMAGE YOU JUST CREATED.

Seems to have broken after recent update. Can't open Google Voice in a container anymore. Get "The page isn’t redirecting properly"

Di base è ottima ma è troppo limitata. Oggi ho perso tutte le preferenze e non posso recuperarle. Per favore aggiungete il backup, inoltre non è possibile selezionare da menu i siti salvati, dovete creare una UI decisamente più completa e che permetta di personalizzare i domini aggiunti.

Interrupts the user with a review request - literally unusable

Hmm, 2nd extension with this error:

"Download failed. Please check your connection."

The other one just now was Facebook container.

So is the problem the apps? Or the Mozilla app store?

Only other possibility: the system level ad-blocking built into Peppermint OS.