@s_p if you are worried about losing your passwords, bookmarks, settings, etc., then you can e.g. log into firefox with an email address. your data is then “save” on some server at firefox. assuming you trust firefox. is practical, you can sync all your data with other firefox installations.
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Why not use Appimage of your favorite build of Firefox. It’s containerized, so it cannot get confused as you say.
Btw, @s_p, welcome to the wonderful world of 
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I actually think it will still share the profile. It isn’t sandboxed. It just packaged in a container
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Firefox doesn’t save anything on any server, it just let you sync data accross your devices. Reference: https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer
That’s pretty cool if you’re concerned about privacy.
Where does it say it store anything on a server?
It doesn’t, Firefox just “copy” (sync) selected data across synched devices.
Why do you think that? If that was true than multiple devices would have to be online at the same time for the sync to work.
Upon further reading, it does appear to save the data on their servers.
I mean, realistically it would have to store to work the way it does.
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the following documentation explains that the data is encrypted on the client and then loaded on the sync server. has the purpose that not all clients to be synchronized always have to be online.
https://moz-services-docs.readthedocs.io/en/latest/sync/overview.html
Because I’ve tried synching data before switching from Windows 10 to Linux. And yes, I could only do the sync by getting both devices online at the same time.
I’ve found that a little complicated and saved all data manually.
Well…the documentation seems to disagree with you.
that’s strange, because my firefox synchronizes even if only one device is online. maybe you can set that somewhere.
Well, I’m sure I was in a hurry to get rid of Windows, so surely I didn’t read all in detail.
My apologies for the misinformation. 
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I wouldn’t trust anyone including Mozilla, but I do use their syncing. But I would never save passwords on it.
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I also sync passwords with it, except for sensitive accounts.
Edit: theoretically you could also synchronize sensitive accounts if you use 2 factor authentication.
That is a given, but I have on the bucket list to add a self hosted Bitwarden.
this is a good solution, you are the master of your data 
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You are absolutely right @dalto. I forgot it shares its files. But wouldn’t Flatpak also share its files?
Unless you explicitly allow it to, a browser flatpak shouldn’t be able to access your home directory.
Technically the defaults are controlled by the packager but that would be pretty bad form for a browser. Even is the packager does allow it, you can override the default.
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