Review Mozilla megalist

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Bugzilla: I could not find a meta issue :(

Description

Upstream has been developing a feature internally called "MegaList", and it is slowly becoming more prominent. It aggregates passwords, credit cards and addresses into one list, that can be shown in the sidebar.

I don't think this opens up anything particularly bad for Tor Browser. But it could just be functionally not useful or broken because we disable the saving of credit card and addresses (I think).

We can probably just make sure it stays disabled via a pref.

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