- Issuer
- Let's Encrypt
- Max TLS
- TLS1.3
- Cipher
- ECDHE-RSA-CHACHA20-POLY1305
- Expires
- 10/26/2026 (expired 8 days ago)
- HSTS
- ✓ Enabled
- OCSP Stapling
- Disabled
- Last scanned
- 9/10/2026, 7:36:36 AM
Report summary
addons.mozilla.org currently holds an SSL grade of A+ (100/100) from CertH TLS health monitoring. The site supports TLS1.3, TLS1.2, has HSTS enabled, and its certificate is issued by Let's Encrypt — the certificate has expired. CertH records daily TLS handshake probes into an auditable certificate health trend.
Excellent — A near-perfect setup: TLS 1.3, strong ciphers, full forward secrecy (PFS) and correctly enabled HSTS. First choice for finance, payments and other high-stakes businesses.
addons.mozilla.org scores higher than 99% of the 12,267 sites we grade.
Last scanned 54 days ago — this data may be stale
Full certificate & config details
- Common Name
- addons.mozilla.org
- Key
- rsaencryption 2048bit
- Sig Hash
- SHA-256
- SAN
- addons.mozilla.org · services.addons.mozilla.org
- Fingerprint
- b178dd513909c2fe23cc5fcff829b1f6f0227995217e2edda3ece9fc2b6e113f
What’s working
- TLS 1.3 enabled
- HSTS enabled with a long max-age
- Complete certificate chain
- No legacy TLS or weak ciphers
Score trend
Recent history
| Time | Grade | Score | Issuer |
|---|---|---|---|
| 9/10/2026, 7:36:36 AM | A+ | 100 | Let's Encrypt |
Score change insights · Last 90 days
No score changes recorded yet. Once snapshots accumulate, this section shows why the score moved.
FAQ
When does addons.mozilla.org’s certificate expire?
addons.mozilla.org’s certificate expires on 10/26/2026, in -8 days, issued by Let's Encrypt.
Is addons.mozilla.org’s TLS configuration secure?
addons.mozilla.org currently scores A+ (100/100). It negotiates TLS1.3, TLS1.2 and has HSTS enabled.
Why did addons.mozilla.org’s score change?
No score changes were recorded for addons.mozilla.org in the last 90 days.