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Security report for firefox.com

Mozilla · Technology · N/a

Low risk. No critical or high findings.

Security score

86/100

Risk levelLow

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

Mozilla operates Firefox, a widely recognized free and open-source web browser focused on privacy, security, and user control. The website www.firefox.com serves as a portal for downloading Firefox across multiple platforms including desktop and mobile. The site emphasizes privacy features such as ad tracker blocking and fingerprinting protection, aligning with Mozilla's non-profit mission to promote internet health and privacy. The brand is well established with a large global user base and a strong reputation in the technology sector. Technically, the website is built using modern web technologies including JavaScript, CSS, and HTML5, with integrations for error tracking (Sentry) and marketing analytics (Google Tag Manager). The site is mobile-optimized, fast-loading, and accessible, providing a professional user experience with clear navigation and comprehensive content. Privacy compliance is robust, featuring cookie consent banners and links to detailed privacy policies. From a security perspective, the site enforces HTTPS and implements best practices such as cookie consent and error monitoring. However, explicit security policies, incident response contacts, and vulnerability disclosure mechanisms are not publicly detailed, representing areas for improvement. The WHOIS data for www.firefox.com is unavailable, suggesting the domain is unregistered or reserved, which is consistent with Mozilla's primary domain usage under mozilla.org. This does not detract from the legitimacy of the website content. Overall, the website demonstrates a strong security posture, excellent content quality, and good privacy compliance. Strategic recommendations include publishing explicit security and incident response policies, establishing a vulnerability disclosure program, and providing clear security contact channels to enhance trust and transparency.

Scanned

This is an earlier scan of firefox.com. View the latest report

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

No critical or high findings. These medium findings are worth fixing next.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • Medium

      Missing X-XSS-Protection header

      Legacy XSS protection (deprecated but still recommended)

      What to do: Add "X-XSS-Protection: 1; mode=block"

    • Medium

      Missing Permissions-Policy header

      Controls browser features and APIs

      What to do: Implement a Permissions-Policy to restrict feature access

      • OWASP Secure Headers: OWASP Secure Headers Project recommends Permissions-Policy: accelerometer=(), autoplay=(), camera=(), cross-origin-isolated=(),…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Medium

      Privacy policy may not be GDPR compliant

      Privacy policy lacks explicit GDPR compliance elements

      What to do: Update privacy policy to explicitly address GDPR requirements and user rights

  3. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Medium

      No DKIM record found

      DKIM adds cryptographic signatures to emails

      What to do: Configure DKIM with your email provider

    • Medium

      No MTA-STS Policy

      MTA-STS enforces TLS for email delivery

      What to do: Implement MTA-STS to prevent downgrade attacks

Keep watching firefox.com

This scan found 13 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. The full timeline opens with your unlock code.

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
95
Security headers
75
Email security
70
DNS health
90
Network security
100
GDPR outside view
83
Average
86

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

Technical appendix

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

Business context

Business profile

Mozilla positions Firefox as a leading privacy-focused browser alternative to major commercial browsers. Its non-profit business model emphasizes user privacy and internet health rather than direct monetization. The company targets general internet users who value privacy and performance. Mozilla's ecosystem includes extensions, themes, and enterprise solutions, supporting a broad user base across desktop and mobile platforms. The website reflects a mature digital presence with strong branding consistency and trust indicators. Partnerships and integrations with app stores and social media platforms support user acquisition and engagement. The absence of direct contact information on the site suggests a focus on self-service and community support channels.

Security posture

The website exhibits a mature security posture with enforced HTTPS, cookie consent mechanisms, and use of error monitoring tools. No critical vulnerabilities or exposed sensitive data were detected in the HTML content. However, the lack of published security policies, incident response information, and vulnerability disclosure processes indicates gaps in transparency and formal security governance. There is no visible security.txt file or dedicated security contact email, which are recommended best practices. The site’s moderate user tracking via analytics is balanced with privacy compliance measures. Overall, the security maturity is good but could be enhanced by formalizing and publishing security governance documents.

Recommendations

  1. Publish a dedicated security policy page outlining security practices and commitments.
  2. Establish and publicize an incident response contact channel and process.
  3. Implement and publish a vulnerability disclosure policy and security.txt file.
  4. Enhance transparency by providing clear security contact emails (e.g., security@mozilla.org).
  5. Continue to monitor and minimize user tracking to maintain strong privacy compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Mozilla
Description
Firefox is a free web browser backed by Mozilla, a non-profit dedicated to internet health and privacy. It offers faster page loading, less memory usage, and privacy-enhancing features.
Key services
Firefox Browser for desktop and mobile, Privacy and security features like ad tracker blocking and fingerprinting protection, Extensions and themes, Enterprise browser solutions
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, CSS, HTML5, Sentry (error tracking), Google Tag Manager
Platforms
Desktop browsers (Windows, Mac, Linux), Mobile browsers (Android, iOS)
Performance
fast
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
90/100
Good practices seen
  • HTTPS enforced
  • Cookie consent banner implemented
  • No exposed sensitive data in HTML
  • Use of Sentry for error monitoring

Analytics and tracking

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

Advertising

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 downloads
  2. Strong privacy and cookie consent mechanisms present
  3. No direct contact emails or phone numbers found on main site
  4. No explicit security policy or incident response info published
  5. WHOIS data for www.firefox.com domain is missing, indicating domain is not registered or is reserved
  6. Website uses modern web technologies and good SEO practices
  7. Content is safe and suitable for general audiences
  8. Social media presence is strong with official Mozilla accounts linked
Technical notes

Notes

The website uses a modern and performant technology stack with JavaScript, CSS, and HTML5. It integrates Sentry for error tracking and Google Tag Manager for analytics and marketing. The site is mobile-optimized and accessible, with good SEO practices including meta tags and Open Graph data. No CMS or hosting provider details are explicitly detected. The site loads quickly and provides a professional user experience. Opportunities exist to improve technical documentation around security and privacy, and to enhance formal compliance disclosures.
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. 86/100 +2Low22 findingsView report
  2. 84/100Low23 findingsView report
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