eirk I think some confustion has happened since I used Arc as an example when making my request when I should have used Firefox from the beginning to simplify things. I am not requesting profiles which I am aware Orion already has. I am requesting that when firefox-style containers are added to Orion that they are able to be assigned to entire saved windows, meaning you could easily switch between say default and work containers while sharing history/extensions/etc without creating a new window.
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Something like Firefox multi account containers by default.
GreyAsteroid you're asking for switching between saved windows, linked to different profiles, in one window, right?
eirk Yes that is correct. This would mimic the functionality I currently have setup with Firefox + Sidebery. I was under the impression it worked the same way with Arc but it seems their synced extensions fooled me 
GreyAsteroid id suggest making a separate post for that, and put smth in the title like (depends on #43) so we know for reference that it depends on this issue.
Here is the thread I created for my feature request. https://orionfeedback.org/d/4580-assign-containers-to-saved-windows-dependent-on-43
Vlad the other comments posted can be ignored, everything of importance is already in https://orionfeedback.org/d/4580-assign-containers-to-saved-windows-dependent-on-43
19 days later
4 days later
Will this also support ephemeral sessions? I used to use Firefox Multi-Containers and Temporary Containers, where tmp containers would open each tab in an ephemeral session. Its the one thing I missing having migrated from FF.
https://addons.mozilla.org/en-GB/firefox/addon/temporary-containers/
alexkornitzer if ur sure u want each tab to be isolated, u can use private windows. each tab there is isolated from the others
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eirk the problem with private windows is that they drop all data (history, etc). What temporary containers do is preserve all the relevant data (history), but keep each tab isolated (cache, sessions, etc).
2 months later
The other problem with private windows is that some sites use incognito mode / private window detection - sometimes it's intended to be fraud prevention (preventing e-commerce purchases or online banking logins using incognito mode is arguably a good thing from a security point of view), but it can also be used for fingerprinting.
Would love to see multi account container support .
Vlad The mock ups look really great! Is there an ETA for Session tabs to land in the RC build?
Thanks very much for the quick reply, I'll keep an eye out.
3 months later
Came to add my thanks and support to this feature. With the Firefox Multi-Account Container add-on not working in Orion, this feature is the last gap for me between FF and Orion. Sadly the nightmare that is Google's (and others') stalkerish cross-site account synchronization means my workflow is broken without the tab-quarantining provided by Multi-Account Containers so I will be anxiously awaiting Sessions!
10 days later
42648594 I am using Profiles to achieve this, which is a "sledgehammer" approach compared to Containers but does the same thing (with some drawbacks).
robrecord Is there a way to trigger an automatic switch to the correct profile when opening a new URL? In FF, containers are assigned Designated Sites which automatically open a new tab in the relevant container. Seems like in Orion, I'd have to manually open a new tab and select the profile I was to use for that site. Not the end of the world, but a substantial increase in time acorss many dozens of tabs opened throughout a day.