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I’ve been using Firefox Containers for years through Mozilla’s Multi-Account Containers extension.[1] Now that container management is available directly in Firefox, I’d prefer to use the native implementation if possible.

Mozilla notes that the extension still adds some functionality:

> “Installing the Multi-Account Containers extension developed by Mozilla provides a few benefits on top of the native container functionality like site-specific container assignments, syncing across devices, and integration with Mozilla VPN or your own proxy.”[2]

I don’t currently need any of those additional features, so the native version would probably be enough for me. What I haven’t been able to figure out is how to switch without losing my existing setup. Are the containers created by the extension already shared with Firefox’s native container manager, or is there some migration process? Can I safely uninstall the extension and keep my existing containers, names, colors, icons, cookies, and active sessions?

[1] https://addons.mozilla.org/en-US/firefox/addon/multi-account...

[2] https://support.mozilla.org/en-US/kb/how-use-firefox-contain...

Firefox's Multi-Account Containers changed the game for me back in 2018 or 2019, and is what got me to switch back to Firefox for 95% of my personal browser use. The "Always open {{domain}} in this container" and the ability to open a specific container with a keyboard shortcut seem like small things, but I can't imagine life without them anymore.

I never understood why it was set off to the side in an (official, first-party) extension, because I was always afraid they would one day stop supporting it. Now when I explain to people why I prefer Firefox, I don't have to explain "There's this extension, don't worry it's official, that allows me to..." I can just say "It has containers built-in. They're great. Try them."

Good that they are integrating that into the main browser.

For me the big use case is having different Google accounts active in one window. Work and private. And when I was doing freelance projects, I sometimes had 3 or 4 different Google accounts active. Plus assorted stuff tied to those accounts. Using different colors for each makes it easy to tell apart the tabs.

Another use case is if you are testing the same app for different customers with different credentials. I do this a lot and I have dedicated containers for each customer so I can easily switch with out having to log out and in a lot.

And of course some companies that can't be trusted with cookies, like Facebook, get isolated. I open that container less and less these days. But I still check every few months. I also keep my bank's website in its own container just on principle.

I should not have to:

- Install add-ons like "Temporary Containers"

- And if some people do they should certainly not have to deal with a bloated container list with temp container names

- Just let me select how I want this "containers" feature - like "open all links in unique temp containers" (unless I select otherwise or set otherwise for certain websites, then go to that container), maybe let me select a sub rule like "based on domain" or "subdomains" (group tabs/windows)

- I should not have to go and toggle "Limit to designated sites" in every bloody container I have created and I have created (had to create!) way too many already.

There are apparently other container add-ons like Temporary Containers (and a Plus ones as well) and Auto Containers but I really should not have to do all that.

MAC is a great add-on and far head of any browser out there in this regard but the feature has been sort of "contained" for far too long and not been made flexible/usable enough.

I have had four or five different Firefox profiles for years. That nicely separates everything I do in these different contexts. I've never understood what capability containers really add to that. Maybe this was explained back when containers were introduced and I missed it, but it really seems like Mozilla has spent a lot of work here for something that already existed with profiles.

Edit: this is addressed in another comment thread, no need to respond here.

Very cool. This should be a default feature in all browsers.

Oh this seems very useful, I hope we'll get it on Chrome sometime. At the moment I have to use profiles to achieve the same thing

I use profiles for this, I wonder what the tradeoffs are between the two approaches. I've actually been thinking about building some tools to make it easier to create and manage profiles on the fly. For me I really think profiles are better since the boundaries are harder - there's no worry about accidentally hitting the "log in with Google" button and clearly identifying myself to a site or similar, because I read the news in a separate profile from my Google account. And it would be nice if those sort of guardrails were very intuitive and easy to set up by default. But I feel like containers may be too squishy.

This is great, and the direction Firefox should focus on: creating user-first features that other browsers won't and extension authors can't.

I only wish it was more automated. Every site should automatically get its own container.

How much of the anti-tracking value is defeated by non-cookie browser fingerprinting?

I am in too many MS365 orgs. Firefox containers are the best solution to manage this, but, I simply have too many issues with Teams (especially with Teams org switching, sometimes needed when someone invites your org account into another) and I find myself back in Chrome and Edge, deleting config folders etc (all in Linux). It’s not fair!!!

Is there a way to assign certain domains to always open in a certain container? e.g., if I type the url of my bank that it immediately becomes a banking container? That would be great.

Multi-Account Containers paired with Container Proxy allows for some really cool setups. I especially like the options to use socks proxies. Hope they will add proper proxy support later.

Multi-account containers is the main reason why I stick to Firefox. Safari and Chrome also have container features (more like profiles, really), but they don't work the same: you open tabs in a separate profile and you can't have tabs, each in a different container, side by side.

I'm curious about Mozilla's seeming shift in strategy (possibly it was awhile ago and I overlooked it):

For a long time, with relatively limited (compared to Google and Apple) development resources, they focused on minimizing upkeep and technical debt. They added and maintained features appealing to the vast majority, the non-technical users, and left the rest to extensions.

Now I'm seeing geek and power user favorites like a built-in color picker, PDF editing features, and now multi-account containers moved into the browser. What changed? Are they focusing on different audience? Do they have new resources so that they can afford maintaining all these additional, more niche features?

Oddly enough I thought Firefox had that a few years ago. I forget what I used - maybe a Mozilla extension? - but it even colour-coded tabs.

Am I wrong? Was it unofficial? A hack?

Nice to see this land as part of FF now instead of an extension. Very useful feature!

Curious how is this better than using multiple profiles (config:profiles) to isolate one set of behaviors from another?

I’ve been doing that for years.

My guess as to what's new here is... nothing.

I'm thinking they will change the containers preference to default to on, and if the extension enabled the preference before maybe that's being removed. Otherwise the containers functionality in Firefox or the extensions in the extensions remain exactly as they were before.

So you still need the extension as it has the critical functionality of Ctrl-Shift-1 to open a new tab of the first container type.

I am a big user of the multi-account containers extension. It is nice to keep banking in one container, Amazon in its own container, social media in its own, and so on.

Syncing across device and always reopening a certain site/domain inside a specific container are must-have features, so I think I'll keep using the extension until they are available natively.

For once, that's a great thing. I'm glad Firefox includes it directly into the app, but could we also use that opportunity to get it to work on Android ?

Extensions per container would be a great addition if they don't already have that planned or available. Sometimes an extensions for privacy or security interferes with a website and if I could fork my base enabled extensions then disable a few for just that site it could keep things more compact and organized instead of having to clone a profile for every website with issues.

But Firefox also has browser profiles now (something I wanted for so long I moved back to chrome to get it), so what’s the purpose of first-party containers now? Don’t browser profiles provide a more robust, very visible delineation between different accounts/user profiles?

The only feature I need to make containers complete is setting a container as the current container for external links.

It's a real pain to click links in slack/etc open in the wrong account. I would be okay with some type of "links currently open in which container" setting, and changing that as needed. Or some selector when external.

This is one of the killer Firefox features. I'm so happy to see it's getting added by default!

I'm a little confused here, I've been using the containers feature already for years now on Firefox. And I have no add-on installed for it, it just works.

So what is it that they're adding?

Huh, I'd been using this through Sidebery for so long I thought it was a built in feature.

I would love to see a better UI for

  - Forcing container usage/default window popup for assigning sites to containers
  - Viewing a list of websites assigned per container

That said I think containers are a great idea, I currently use it to isolate Meta and Amazon sites. Could probably be doing more.

I hope they improve the UI, it has been difficult to use. Several menus with different random functionality that don’t have the options I’m looking for. Many times I have to hunt through the extension preferences to do simple things.

Also the “temporary container” extension is quite useful and closer to what I need in the first place.

I'm glad that Firefox is catching up, but they still have a lot of catching up to do compared to Arc/Zen. You got people out there like xe-darc innovating on putting Docker containers in your browser, and Firefox is just getting preview support for built in profiles.

Amazing news. Wonder if this will be synced on multiple machines through Mozilla Connect, since that wasn't the case with the Mozilla’s Multi-Account Containers extension before.

I hope it is, since it was a major pain point before.

This is not new, and it's weird that this blog post doesn't acknowledge that.

A a snapshot from 2017 [0] of their docs show the UI for this very feature. A snapshot from 2023 of their knowledge base [1] says that "Firefox Containers is a basic built-in feature".

I just created a new profile in Firefox 140 ESR, started it in safe mode (which disables extensions), enabled "privacy.userContext.enabled" in about:config - and there you go, native containers accessible from File -> New Container Tab.

I'm not talking about the Multi-Account Containers extension. There are no extensions installed or enabled. It comes with Firefox 140 ESR, without extensions.

The Containers feature is already a "native, first-party feature" in older versions of Firefox. Firefox already has a "first-party version of containers". They have already brought it "directly into the heart of Firefox for all to benefit".

So what are they talking about in this blog post? Are they simply flipping the config setting to true by default? Are they replacing the existing "Containers" feature with a new feature which is also called "Containers"? Are they rebranding the Multi-Account Containers extension as "Containers" and making it built-in (seemingly not, since apparently "Not all of the features of the add-on are available in the first-party version of containers").

[0] https://web.archive.org/web/20170821073747/https://developer...

[1] https://web.archive.org/web/20230307151023/https://support.m...

Does Chrome have this yet? It's basically the single feature I use Firefox for. And no, container tabs & incognito mode don't count.

Are they shipping it on Android, too?

tree style tabs and container-locked windows. that will make firefox perfect.