CA/Additional Trust Changes
The Mozilla Root Program's official repository of the roots it trusts is certdata.txt. Some information about the level of trust in each root is included in that file - for example, whether it's trusted for server SSL, S/MIME or both. However, not all restrictions recommended by Mozilla on the roots can be or are encoded in certdata.txt. Some are implemented in our security library, "NSS", or in Firefox and Thunderbird (so-called "PSM").
Sometimes, other companies and organizations decide to use Mozilla's root store in their products. As the CA FAQ notes, Mozilla does not promise to take into account the needs of other users of its root store when making decisions. However, for the benefit of such users and on a best-efforts basis, this page documents the additional trust settings that Mozilla recommends.
Extended Validation (EV)
The status of whether a root is approved to issue EV certificates or not is stored in PSM rather than certdata.txt.
While not technically a modification to the root store as we don't use it for un-trusting roots, Mozilla's OneCRL system is used for communicating information about the revocation of intermediate certificates (and high-profile misissued end-entity certificates) to Firefox clients.
The French Government CA is name-constrained to those ccTLDs whose geographies are under the jurisdiction of France - that is, .fr, .gp, .gf, .mq, .re, .yt, .pm, .bl, .mf, .wf, .pf, .nc, and .tf. The code for that is in NSS.
The Turkish Government CA is name-constrained to a set of turkish toplevel domains - that is, .gov.tr, .k12.tr, .pol.tr, .mil.tr, .tsk.tr, .kep.tr, .bel.tr, .edu.tr and .org.tr. The code for that is in NSS.
In accordance with the consensus proposal that was adopted in 2017, Mozilla plans to distrust Symantec (including GeoTrust, RapidSSL, and Thawte) certificates issued before 1-June 2016 starting in Firefox 60 unless they are issued by whitelisted subordinate CAs that have the following SHA-256 Subject Public Key hashes (subjectPublicKeyInfo):
Note: In some instances, multiple subordinate CAs contain the same public key, necessitating whitelisting by subjectPublicKeyInfo. Refer to (Bug 1409257) for more information.
The Firefox preference "security.pki.distrust_ca_policy" may be set to '1' to enable and '0' to override these changes.
In Firefox 63, Mozilla plans to remove the ‘before 1-June 2016’ rule and all Symantec TLS certificates will be distrusted except those issued by the whitelisted subordinate CAs listed above.
In a future Firefox release, we expect to remove the whitelist, and remove the ‘websites’ trust bit from all Symantec roots. The timing of these changes, and any changes to the ‘email’ trust bit (S/MIME) have not yet been determined.