Create temporary profile

[Oxym]

Since Firefox update process is broken for Windows 10 - when not installed from Microsoft store (I don't know whether it is broken when installed from the store, because I haven't tested it, yet) - and results in Firefox being downgraded and upgraded a few times before the new version may run, it is annoying that after each update I'm ending with another profile being created for me - because it says that an old profile can't be used on a downgraded version (I already have 19 profiles on one of my machines and 3 on the other one). If the update process can't be fixed, it would be nice to at least be able to make a profile management more streamlined - for example, there might be a temporary profile created when upgrade/downgrade takes place and when everything is sorted out the user might be offered to return to the previous profile.

I'm aware that similar idea was raised under https://connect.mozilla.org/t5/ideas/create-temporary-profile-for-background-updates-to-allow-more/i... but it is trying to address slightly different scenario, so it is possible that it needs a different solution

[Jon]

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