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Does cloning profiles (by copying an existing profile content to a new folder with a new name) work seamlessly? Or does every profile have some unique identifier that can cause problems if just copied over?

The reason I ask is because I have some basic setup config that I would rather not have to manually re-do for every profile.

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In my experience, just copying an existing profile to a new folder doesn't work -- you're backing up your data, but you're not creating a new profile.

So what I typically do is first create a new profile via Firefox' UI, then I just copy the data of the profile I want to clone into the corresponding data folder of the profile I just created.

I did not try cloning, but I do have several profiles whose settings/plugins are synced by using Firefox Sync (you can select which things to sync).

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