Productivity
BlockNSFW
Last updated 2026-08-15 · benchmark measured 2026-09-16 — deterministic & reproducible
Firefox extension that blocks adult and pornographic content before it loads.
BlockNSFW at a glance
BlockNSFW is a Firefox extension that blocks adult and pornographic content before it loads, aimed at parents, students, professionals, families, and privacy-conscious users.
Good for
- Parents who want to keep adult content from loading in a family browser
- Students or professionals who want a cleaner browsing environment
- Privacy-conscious users who want content filtering without accounts or data collection
Questions people ask
How does BlockNSFW block adult content?
It uses layered detection including updated domain blocklists, on-device AI text and image scanning, multilingual hostname filtering, and SafeSearch enforcement on major search engines.
Does BlockNSFW collect my browsing data?
No, all processing runs locally on the device with no accounts or browsing data collected.
Does BlockNSFW work in languages other than English?
Yes, it includes multilingual hostname filtering for Chinese, Korean, Russian, Arabic, and Thai.
Can BlockNSFW add extra protection beyond the browser?
It offers optional DNS protection via Cloudflare for Families.
Can I customize what BlockNSFW blocks?
Yes, it includes activity tracking and whitelist management.
Written by Legit.Show from addons.mozilla.org on 2026-10-22. It does not change the score.
Are you the maker of BlockNSFW? Claim this listing. It is free, takes a meta tag, a DNS record or GitHub admin rights, and never changes the score.
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To cite this score: legit.show/s/ff-blocknsfw/2026-09-16. That address never changes; this page moves with every re-measure.
Legit.Show scored BlockNSFW 74/100 on 2026-09-16, measured across all 7 frames from its public surface. legit.show/s/ff-blocknsfw/2026-09-16
Is BlockNSFW production-ready?
Legit.Show scores BlockNSFW 74 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on BlockNSFW (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Reliability; its weakest is Privacy. Every frame it averages is published with its evidence on the Legit.Show listing.
The 7 Frames
- Performance — 59/100
- Accessibility — 95/100
- Security — 90/100How this compares across the catalogue: The Web Security Baseline
- Privacy — 0/100How this compares across the catalogue: The Privacy Gap
- Reliability — 100/100
- Standards — 92/100
- Discoverability — 85/100
What we measured
- Security headers present: CSP, HSTS, X-Frame-Options, X-Content-Type-Options.
- Served over HTTPS with a valid certificate.
- Real Lighthouse performance run — 228 ms to first byte.
- Returns a proper 404 for unknown routes.
- 3 of 3 sampled routes reachable.
- No privacy policy found.
- Sets cookies / loads scripts with no consent prompt.
- Discoverable: sitemap, OpenGraph image, canonical URL.
Who it's for
Parents · Students · Professionals · Families · Privacy-conscious users
Sources and updates
- Description
- Taken from addons.mozilla.org's own website on 2026-08-15.
- Operator
- Mozilla, as named in addons.mozilla.org's terms, privacy page or footer.
- Benchmark
- Measured by Legit.Show from the live site, the way any visitor sees it — with no access to its code or accounts. Same method for every product, and no AI decides the score. Last checked 2026-09-16.
Put together from public information, without BlockNSFW's involvement. If anything here is wrong, tell us and a person will check it.
Visit BlockNSFW → · Alternatives to BlockNSFW → · How this was measured →