Is Web Threat Shield Safe?
Web Threat Shield — Nerq Trust Score 50.5/100 (C- grade). Score based on 2 independent trust signals. Last analyzed: 2026-04-12
Web Threat Shield is a Firefox extension with a Nerq Trust Score of 50.5/100 (C-), based on 3 independent data dimensions. Last analyzed: 2026-04-12 Security: 90/100. Popularity: 15/100. Data sourced from addons.mozilla.org metadata, permissions analysis, and source code availability. Last updated: 2026-04-12. Machine-readable data (JSON).
Is Web Threat Shield safe?
Trust Score Breakdown — Web Threat Shield has a Nerq Trust Score of 50.5/100 (C-). Measured across 2 independent trust signals (as of 2026-04-12).
What is Web Threat Shield's trust score?
Web Threat Shield has a Nerq Trust Score of 50.5/100, earning a C- grade. This score is based on 2 independently measured dimensions including security, maintenance, and community adoption.
What are the key security findings for Web Threat Shield?
Web Threat Shield's strongest signal is security at 90/100. No known vulnerabilities have been detected.
What is Web Threat Shield and who maintains it?
| Author | Webroot.com |
| Category | Firefox Add-ons |
| Source | N/A |
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Safety Guide: Web Threat Shield
What is Web Threat Shield?
Web Threat Shield is a Firefox add-on — Keeps you safe when browsing the web by identifying and blocking dangerous websites..
How to Verify Safety
Review permissions on addons.mozilla.org. Check if source code is available.
You can also check the trust score via API: GET /v1/preflight?target=Web Threat Shield
Key Safety Concerns for Firefox add-on
When evaluating any Firefox add-on, watch for: excessive permissions, data harvesting.
Measured Signals
Web Threat Shield has a Nerq Trust Score of 50/100 (C-). This score is a composite of automated measurements of security, maintenance, community, and quality signals.
Key Takeaways
- Web Threat Shield has a Trust Score of 50/100 (C-).
- The score is a measured composite — it is not a suitability judgment. Evaluate the individual signals against your own requirements.
- Query the current measured values via the Nerq API.
Detailed Score Analysis
| Dimension | Score |
|---|---|
| Security | 90/100 |
| Maintenance | 50/100 |
| Popularity | 15/100 |
| Quality | 40/100 |
| Community | 35/100 |
Based on 5 dimensions. Data from addons.mozilla.org metadata, permissions analysis, and source code availability.
What data does Web Threat Shield collect?
Web Threat Shield has a privacy score of 90/100. Review the documentation and privacy policy for data handling details.
Full analysis: Web Threat Shield Privacy Report · Privacy review
Is Web Threat Shield secure?
Security score: 90/100 (0-100, higher = fewer measured security issues).
Nerq monitors this entity against NVD, OSV.dev, and registry-specific vulnerability databases for ongoing security assessment.
Full analysis: Web Threat Shield Security Report
How we calculated this score
Web Threat Shield's trust score of 50.5/100 (C-) is computed from addons.mozilla.org metadata, permissions analysis, and source code availability. The score reflects 5 independent dimensions: security (90/100), maintenance (50/100), popularity (15/100), quality (40/100), community (35/100). Each dimension is weighted equally to produce the composite trust score.
Nerq analyzes over 7.5 million entities across 26 registries using the same methodology, enabling direct cross-entity comparison. Scores are updated continuously as new data becomes available.
Signals last measured on April 12, 2026. Data version: 1.0.
Full methodology documentation · Machine-readable data (JSON API)
Frequently Asked Questions
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Disclaimer: Nerq trust scores are automated measurements based on publicly available signals. They are not endorsements, verdicts, or guarantees of suitability. Always evaluate the signals against your own requirements.