Skip to main content

Security report for mozilla.org

Mozilla Corporation · Technology · United States

Low risk. 1 critical or high finding in SSL/TLS.

Security score

84/100

Risk levelLow

0–100, higher is better. How it is calculated

Mozilla Corporation is a globally recognized non-profit organization dedicated to promoting an open and privacy-respecting internet. Their product portfolio includes the Firefox browser, Thunderbird email client, Mozilla VPN, and various privacy and security tools, positioning them as a leader in open-source internet technology. The website reflects a mature digital presence with excellent content quality, clear navigation, and strong branding consistency. Technically, the site employs modern JavaScript, SVG graphics, and integrates Google Tag Manager and Sentry for analytics and error tracking, ensuring robust performance and monitoring. Security posture is strong with HTTPS enforcement, comprehensive security headers, and privacy compliance evidenced by detailed policies and consent mechanisms. No critical vulnerabilities or suspicious content were detected, and the domain is widely trusted despite the absence of detailed WHOIS data due to privacy protection. Overall, Mozilla.org demonstrates a high level of professionalism, trustworthiness, and commitment to user privacy and open internet principles.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

1 finding rated critical or high. Fix these first.

  1. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

Need hands-on remediation? Email guard@offseq.com

Keep watching mozilla.org

This scan found 15 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

Billed monthly to your card. Cancel anytime. See sample alerts.

Full report

€39.90one-time

  • The complete analysis as a PDF you can cite
  • Email delivery with an unlock code
  • Lifetime access to this report

Prices incl. 21% VAT. Secure checkout by Mollie; sold by SEQ SIA, Latvia.

Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
72
Security headers
75
Email security
85
DNS health
90
Network security
100
GDPR outside view
83
Average
84

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Breach exposure

Leaked credentials and lookalike domains from OffSeq Breach. The counts are free; the detailed lists are paid add-ons.

Dark web exposure

Add-on

Leaked records that mention mozilla.org, from OffSeq Breach.

Total records
37,263
Employees
6
Customers
37,204
Third parties
53
Weak passwords
22%

Latest record dated 2026-01-13 · 94 subdomains affected

See the 10 newest leaked credentials

A one-off add-on to this report that lists the most recent identifier and password pairs OffSeq Breach holds for mozilla.org.

Select it in the checkout above.

Masked preview

  • –mozilla.org2026-01-13
  • –mozilla.org2025-08-11
  • –support.mozilla.org2025-08-10
  • –support.mozilla.org2025-07-31
  • –support.mozilla.org2025-07-20

Breach keeps ingesting new leaks, so these numbers can grow between scans.

Open in Breach(opens in a new tab)Monitor on Breach(opens in a new tab)

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Mozilla operates as a large non-profit entity within the technology sector, focusing on privacy, open-source software, and internet advocacy. Their market position is strong, leveraging a well-known brand and a diverse product suite that appeals to privacy-conscious users and developers. Revenue streams likely include donations, partnerships, and possibly advertising through Mozilla Ads. The organization maintains a broad partnership ecosystem including subsidiaries like Mozilla.ai and Mozilla Ventures, enhancing their innovation and funding capabilities. Growth indicators include active community engagement, multiple product launches, and a clear strategic focus on trustworthy AI and internet freedom. The website's comprehensive content and external links to trusted domains reinforce Mozilla's credibility and influence in the digital ecosystem.

Security posture

Mozilla.org exhibits a mature security posture with HTTPS enforced site-wide, implementation of key security headers such as Content-Security-Policy and Strict-Transport-Security, and a visible cookie consent mechanism aligned with GDPR requirements. No exposed sensitive data or vulnerable libraries were identified in the HTML content. However, explicit security policies, incident response details, and vulnerability disclosure programs are not prominently published, representing an area for improvement. The absence of direct contact channels for security incidents or a security.txt file limits transparency in incident response readiness. Overall, the site maintains strong baseline security practices suitable for a high-profile technology organization but could enhance trust by publishing more detailed security governance information.

Recommendations

  1. Publish a dedicated security policy and incident response page to improve transparency and user trust.
  2. Implement and publicize a vulnerability disclosure program and security.txt file to facilitate responsible reporting.
  3. Provide contact information for a Data Protection Officer or security team to enhance compliance and communication.
  4. Continue regular security audits and update security headers and libraries to maintain a strong security posture.
  5. Enhance user education on privacy and security practices through visible site content and resources.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mozilla Corporation
Description
Mozilla is a non-profit organization working to put control of the internet back in the hands of the people using it. They offer products like Firefox browser, Thunderbird email client, Mozilla VPN, Mozilla Monitor, Firefox Relay, Pocket, MDN Plus, and Thunderbird.
Key services
Firefox browser, Thunderbird email client, Mozilla VPN, Mozilla Monitor, Firefox Relay, Pocket, MDN Plus, Mozilla Foundation advocacy and funding
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, SVG, Google Tag Manager, Sentry, HTML5, CSS3
Performance
fast
Mobile
excellent
Accessibility
good
SEO
excellent

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Security headers implemented
  • Consent banner for cookies
  • No exposed sensitive data in HTML
  • Secure forms with validation

Analytics and tracking

Services
Google Tag Manager, Sentry
Tracking level
moderate
Privacy practices
good

Advertising

Ad networks
Mozilla Ads
Tracking pixels
Sentry
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with rich content and multiple product offerings.
  2. Strong emphasis on privacy, open-source, and user empowerment.
  3. Comprehensive privacy and cookie policies with consent mechanisms.
  4. No suspicious or malicious content detected.
  5. Multiple social media and external links to trusted domains.
  6. No exposed sensitive data or security vulnerabilities found in HTML.
  7. WHOIS data is unavailable but domain is widely recognized and trusted.
Technical notes

Notes

The website is built using modern web technologies including JavaScript and SVG for rich interactive content and graphics. It integrates Google Tag Manager and Sentry for analytics and error monitoring, indicating a mature approach to performance and reliability. The site is mobile-optimized with responsive design and accessibility considerations, ensuring broad usability. No CMS or hosting provider details were explicitly detected, but the site performance and structure suggest professional hosting and content management. The technical implementation supports fast loading times and good SEO practices through proper meta tags and structured navigation. Opportunities exist to further enhance technical documentation and transparency around security and compliance frameworks.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

Earlier scans of this domain

  1. 88/100Low20 findingsView report
  2. 88/100 +8Low20 findingsView report
  3. 80/100Low19 findingsView report
Reviews of this site

Share your experience with mozilla.org. Every review is verified by email and published after moderation.

Overall rating
Select a rating
4000 characters remaining

We’ll email you to confirm your review and keep your details private.

Community rating

No published reviews yet. Be the first to review mozilla.org.

Feedback on this report

Rate this report, add an optional comment, and tell us if you want a security specialist to follow up.

Overall report quality
Select a rating
2000 characters remaining

We only use your feedback to improve Guard reports. Contact details are never shared.