Add Firefox policies to allow about:sync-log and about:about to be blocked

[Mr_Frog]

There are Firefox policies that can be applied via a policies.json file that restrict user's access to some Firefox about pages such as about:addons and about:profiles. I would like there to be a policy added that works in the exact same way but blocks the about:sync-log and about:about pages. This is in service of keeping the current Firefox web profile folder hidden.

[Jon]

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