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Is Multi-Account Containers feature a built-in feature?

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I am aware of the "Multi-Account Containers" and also know how they works. However, I found a add-on by Firefox named "Firefox Multi-Account Containers". Even if I don't install this add-on I can still use the container feature (Note: I have only installed Facebook container). So, is it necessary to install this "Firefox Multi-Account Containers"? Tough I didn't see much difference before & after installing this add-on. So, is this add-on now built-in? Or what will I get extra for installing this add-on?

I am aware of the "Multi-Account Containers" and also know how they works. However, I found a add-on by Firefox named "Firefox Multi-Account Containers". Even if I don't install this add-on I can still use the container feature (Note: I have only installed Facebook container). So, is it necessary to install this "Firefox Multi-Account Containers"? Tough I didn't see much difference before & after installing this add-on. So, is this add-on now built-in? Or what will I get extra for installing this add-on?

Chosen solution

Yes and no.

The containers are a builtin feature that other add-ons can make use of, but you can't actually use them without an add-on. So because you have the Facebook containers add-on installed, you will see containers enabled in your browser since that add-on uses that feature.

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Chosen Solution

Yes and no.

The containers are a builtin feature that other add-ons can make use of, but you can't actually use them without an add-on. So because you have the Facebook containers add-on installed, you will see containers enabled in your browser since that add-on uses that feature.