I don't use Firefox Multi-Account Containers to its full potential, and it's great when I do use it. Wish it existed years ago.
It's going to take some time to focus on creating meaningful containers (and applying them). From there, it should be easy.

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.

Amazing. Was using two profiles w/o knowing this extension exists. Thanks, Mozilla.

Privacy on the fly!

Wonderful tool for keeping your browsing efforts separated and fenced off from nosy Bots.

Seems like I had to do three things to make reopening in the right container "auto-magic";

Open a new tab in the "Amazon" container (long click on '+'). Past the URL into the new Amazon container tab.
Click the Multi-container symbol and select "Always open in Amazon"
Open a non-container tab and paste the URL, select "Remember my decision to always open in Amazon container"

After all 3 of these steps are done, the URL will always open in the selected container.

Once these 3 steps are done you're all set. However there are currently 2 things missing from this and other "container tools";

1. Easy Export/backup/restore/Import of container rules. It would be lovely if this capability were available in CSV and JSON formats. [Necessary for setup of multiple machines without Sync, and off-site storage of config(s)]

2. An easy way to Edit container rules beyond just delete and start over. This will allow quickly changing custom behavior(s). #1 might take this issue toward "feasible".

I put my own website (with multiple applications) in a container to keep nosy bots out of my site cookie jars.

Great idea, love having this feature. I'm tired of having everything I looked at on Amazon.com show up in my Facebook feed. This is a win for privacy and giving browser experience control back to the user. No other browser appears to have these tools, just Firefox.

Really fantastic add-on that boosts productivity. Allows you to compartmentalize your work tabs, social media tabs, banking tabs, whatever. This add-on keeps the cookies separate between tabs of different types, too, which is really great - I can have a Google Work tab open (with me logged in at work), and a Google Personal tab open with my Google Drive handy.

Importantly, you can specify that certain websites should always open in a certain type of tab (e.g., Asana should always open in a Work tab), which is invaluable for keeping things separate.

I also like the ability to sort tabs by container (move all your Banking tabs next to each other, for example), as well as the ability to reopen all tabs of a certain type in a different window. You can also create custom categories, etc. If you're anything like me, you have a million different tabs, and being able to pull out all my Work tabs all at once is a huge lifesaver for me organizationally.

Well done, Mozilla! -A big fan.

Cannot inherit container from last usage.

très bien

That's an excellent idea, but it can be way better. First of all, it should be incorpored to the browser as a feature, including the mobile browser. Second, the settings should be sync on Firefox Account Sync. Another great feature would be the possibilitie of incorporate domains to a container (ex.: add just google.com instead of keep.google.com, calendar.google.com, etc etc). Please, Mozilla, keep working on it!

I love my wife I told her I did know anything and really I did not dumb by know means but she spent a whole teaching her self and it got to the point I could do nothing or see nothing I know something was wrong so I'm a mth and a half I taught my self and locked her she super pissed but I love you Mamas

Excellent idea, but i can't actually use it without analogue in mobile browser.