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Will this allow you to run several profiles side by side using the same version of the browser, like with Chrome?

Other people have already answered your actual question, so I'll weigh in on my assumptions of your use case instead :).

I find that multi-account containers give me much of what I would otherwise gain from running in multiple profiles, in as much as cache, cookies and other state are separate, so I can be logged in to a different set of accounts in each container. Temporary Containers makes life ever easier -- a whole new empty state at the push of a button, and parallel non-shared state: it's much more usable than Incognito for web development and testing.

On the other hand, if you want a different set of extensions then multi-profile is the only way to go.

https://addons.mozilla.org/en-GB/firefox/addon/multi-account... https://addons.mozilla.org/en-GB/firefox/addon/temporary-con...

I think you can already do that?

You can, if you run Firefox with -P and profile name. I run two instances most days.

Yeah, just start the profile manager (firefox --ProfileManager), create a new profile, and then run the "other instance" with --profile NAME. Sometimes --no-remote is also helpful, so clicking on some links will not open them in this other profile.

This can also be done from within the browser: navigate to about:profiles.

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