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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Firefox 37 introduced OneCRL, Mozilla’s centralized list for distributing revoked intermediate certificate authority (CA) certificates. Instead of waiting for a complete Firefox update and browser restart, users could receive updated revocation information through Firefox’s existing blocklist process. OneCRL was a targeted measure—not a system for every revoked website certificate.
What OneCRL changed in Firefox 37
Mozilla security engineer Mark Goodwin announced OneCRL on March 3, 2015. The feature extended Firefox’s existing blocklist mechanism so Mozilla could distribute a revised list of revoked intermediate certificates separately from a full browser release. Mozilla said that let users receive fresh revocation information without downloading a Firefox update or restarting the browser. Firefox 37.0 first reached release-channel users on March 31, 2015; its release notes described the change as “Improved protection against site impersonation via OneCRL centralized certificate revocation.”
Before this approach, responding to a serious certificate-revocation incident could involve shipping a browser update and waiting for users to obtain and restart it. OneCRL provided another distribution route for covered certificates. Mozilla also said OneCRL-covered certificates did not require live Online Certificate Status Protocol (OCSP) checks, which can add latency. This was a distinction between a centrally distributed list and checking a certificate’s status online at connection time, not a claim that OneCRL replaced every revocation method.
Which certificates OneCRL initially covered
The initial list was limited to intermediate CA certificates, rather than all certificates issued to individual websites. An intermediate CA is part of the chain that links a website’s certificate to a trusted root certificate in a browser. Mozilla said limiting the list to intermediates helped keep the blocklist’s size down. Its described process was that a CA in Mozilla’s root program would notify Mozilla when an intermediate needed revocation; Mozilla could then distribute that information through the centralized list.
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That boundary matters: OneCRL should not be described as automatically handling every revoked end-entity website certificate. It was a way to push revocation information for a defined class of certificates through a channel Firefox already used for blocklist updates.
Why the CNNIC incident brought OneCRL into focus
In a March 23, 2015 report, Mozilla said it had learned that an intermediate certificate chaining to a root in Mozilla’s root store had been placed in a customer firewall used for SSL man-in-the-middle inspection. According to Mozilla, the firewall generated certificates for domains its owner did not own or control. Mozilla said the CA had revoked the intermediate, that it was adding the certificate to OneCRL for Firefox 37, and that users should upgrade to the latest Firefox. Mozilla’s report said it believed the interception instance was limited to the customer’s internal network.
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The episode illustrated the practical value of a quicker distribution path for a revoked intermediate: browsers could receive the updated information without waiting for a full Firefox release. The incident details and Mozilla’s assessment here are those reported by Mozilla at the time.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.OneCRL is not CRLite
OneCRL is the historical name for the Firefox 37 feature introduced in 2015. Mozilla later announced a distinct system, CRLite, and said Firefox 142 would begin production use of that on-device revocation system. CRLite is a later development; it was not the feature shipped in Firefox 37.
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For historical context, Mozilla’s 2015 OneCRL announcement estimated that around 9% of TLS connections used OCSP stapling. That was a figure from the 2015 announcement, not a current estimate of adoption.
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Mozilla sources
- Mark Goodwin, “Revoking Intermediate Certificates: Introducing OneCRL,” Mozilla Security Blog, March 3, 2015
- “Firefox 37.0 Release Notes,” March 31, 2015
- “Revoking Trust in one CNNIC Intermediate Certificate,” Mozilla Security Blog, March 23, 2015
- Mozilla Bugzilla, Bug 1024809, implementation record
- “Fast, private and secure (pick three): Introducing CRLite,” Mozilla Firefox Blog
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