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docs: explain how to trust the Caddy authority in Firefox #971

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docs: explain how to trust the Caddy authority in Firefox #971

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14 changes: 14 additions & 0 deletions docs/tls.md
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Expand Up @@ -29,6 +29,20 @@ docker compose cp php:/data/caddy/pki/authorities/local/root.crt %TEMP%/root.crt

<!-- markdownlint-enable MD013 -->

### Firefox

Firefox uses its own trust store. Either import `root.crt` in
`Settings > Privacy & Security > View Certificates > Authorities`,
or set `security.enterprise_roots.enabled` to `true` in `about:config`
to make Firefox trust the authorities of the system trust store.

The authority is regenerated when the `caddy_data` volume is removed
(e.g. with `docker compose down -v`).
The new authority has the same name as the previous one,
so if Firefox still trusts the old one, it shows `SEC_ERROR_BAD_SIGNATURE`.
Delete the `Caddy Local Authority` entry in the Authorities tab,
then trust the new `root.crt`.

## Using Custom TLS Certificates

By default, Caddy will automatically generate TLS certificates using Let's Encrypt
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