Firefox config via policies.json

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Thane K. Sherrington

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Aug 6, 2026, 1:09:34 PM (9 days ago) Aug 6
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Hi All,
    If I use a policies.json to configure settings in Firefox, and later delete it, does Firefox revert to defaults, or do I need to reset it with a new policies.json?

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Thane K. Sherrington

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Mike Kaply

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Aug 6, 2026, 1:46:32 PM (9 days ago) Aug 6
to Thane K. Sherrington, enter...@mozilla.org
For most things, they revert to the default settings.

A handful of things persist. Handlers and any user preferences you set come to mind. And any extensions that were installed.

There's no easy way to undo the Handlers stuff because there's currently no way to delete handlers (neither in policy nor in the UI).

Mike

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