Is Buttercup Safe?
Buttercup — Nerq Trust Score 50.5/100 (C- grade). Based on analysis of 2 trust dimensions, it is has notable safety concerns. Last updated: 2026-04-02.
Use Buttercup with some caution. Buttercup is a Firefox add-on with a Nerq Trust Score of 50.5/100 (C-), based on 3 independent data dimensions. It is below the recommended threshold of 70. Security: 90/100. Popularity: 15/100. Data sourced from addons.mozilla.org metadata, permissions analysis, and source code availability. Last updated: 2026-04-02. Machine-readable data (JSON).
Is Buttercup safe?
CAUTION — Buttercup has a Nerq Trust Score of 50.5/100 (C-). It has moderate trust signals but shows some areas of concern that warrant attention. Suitable for development use — review security and maintenance signals before production deployment.
What is Buttercup's trust score?
Buttercup 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 Buttercup?
Buttercup's strongest signal is security at 90/100. No known vulnerabilities have been detected. It has not yet reached the Nerq Verified threshold of 70+.
What is Buttercup and who maintains it?
| Author | MadDev |
| Category | firefox |
| Source | N/A |
Similar Firefox by Trust Score
Safety Guide: Buttercup
What is Buttercup?
Buttercup is a Firefox add-on — Manage your online identities and credentials with Buttercup: An open-source, free and secure credentials manager..
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=Buttercup
Key Safety Concerns for Firefox add-ons
When evaluating any Firefox add-on, watch for: excessive permissions, data harvesting.
Trust Assessment
Buttercup has a Nerq Trust Score of 50/100 (C-) and has not yet reached Nerq trust threshold (70+). This score is based on automated analysis of security, maintenance, community, and quality signals.
Key Takeaways
- Buttercup has a Trust Score of 50/100 (C-).
- Review carefully before use — below trust threshold.
- Always verify independently using the Nerq API.
Frequently Asked Questions
Is Buttercup safe?
What is Buttercup's trust score?
What are safer alternatives to Buttercup?
What permissions does Buttercup need?
Is Buttercup open source?
Popular in firefox
Browse Categories
Disclaimer: Nerq trust scores are automated assessments based on publicly available signals. They are not endorsements or guarantees. Always conduct your own due diligence.