Is Captionsubtitletool Safe?

Captionsubtitletool — Nerq Trust Score 50.5/100 (C- grade). Score based on 2 independent trust signals. Last analyzed: 2026-03-22

Captionsubtitletool is a Firefox extension with a Nerq Trust Score of 50.5/100 (C-), based on 3 independent data dimensions. Last analyzed: 2026-03-22 Security: 90/100. Popularity: 15/100. Data sourced from addons.mozilla.org metadata, permissions analysis, and source code availability. Last updated: 2026-03-22. Machine-readable data (JSON).

Safety Guide: Captionsubtitletool

What is Captionsubtitletool?

Captionsubtitletool is a Firefox add-on — Facility for providing closed captions/subtitles related functions to online videos like Youtube..

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=CaptionSubtitleTool

Key Safety Concerns for Firefox add-on

When evaluating any Firefox add-on, watch for: excessive permissions, data harvesting.

Measured Signals

Captionsubtitletool 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

• Captionsubtitletool 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.

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.