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Preview of OCSP Evaluator

OCSP Evaluator by Francesco De Stefano

Is this site's certificate revoked? Your browser checks OCSP and CRL directly at the issuing authority, with verified signatures and no third-party server. Grade, chain, blocking, monitor. Also on Android.

Available on Firefox for Android™
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Valid certificate: checked with OCSP at the issuer, signature verifiedRevoked certificate: date, reason and grade FThe block page stops a revoked siteYour domains monitored every 12 hours, with notificationsAlso on Firefox for Android
About this extension
OCSP Evaluator 1.0 — rewritten from scratch.

Has the certificate of the site you are visiting been revoked? Your browser tells you, by asking the authority that issued it.

WHAT IT DOES
• Checks revocation with OCSP and, when missing, with the CRL, on the site's real certificate chain. Response signatures are verified.
• Grade from A+ to F, expiry, issuer, validation type (DV, OV, EV), TLS version and algorithm.
• Full certificate chain, with details for each certificate.
• Revoked site: just warn, block the page, or use strict mode, which also blocks sites that cannot be verified.
• Monitor: checks your domains every 12 hours and notifies you when a certificate is revoked, about to expire or replaced.
• Check history, chain and report export, copy the certificate as PEM.
• Check any site on demand.
• Light and dark theme, English and Italian.

ALSO ON ANDROID
Works on Firefox for Android too, with an interface built for the phone.

PRIVACY
No third-party server and no usage statistics. The only requests go to the OCSP and CRL addresses written inside the certificate, that is to the authority that issued it, just like the browser itself does.

Source code: https://sourceforge.net/projects/ocsp-evaluator/
Apache License 2.0.
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Permissions and data

Required permissions:

  • Display notifications to you
  • Access browser tabs

Optional permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Version
1.0.0
Size
65.42 KB
Last updated
3 days ago (Oct 28, 2026)
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