Dr. No — Medical Search Blocker by Joshua Kahn
Stop googling your symptoms. Dr. No hard-blocks medical searches and known medical sites (WebMD, Mayo Clinic, and more) with a friendly ASCII character and a "back to safety" button. Runs entirely on your device — nothing leaves your machine.
Extension Metadata
About this extension
Dr. No is a gentle nudge against 2 a.m. symptom-Googling and WebMD spirals. When it catches a medical search or a known medical site, it hard-blocks the page with a friendly little ASCII character and a "take me back to safety" button — no bypass.
Not medical advice, and not a substitute for one. If you're genuinely worried, call a real human doctor.
What it blocks — Medical search queries on Google, Bing, DuckDuckGo, Yahoo, Ecosia, Startpage, Brave, and Qwant; and known medical sites (WebMD, Mayo Clinic, Healthline, Drugs.com, MedlinePlus, NIH, Cleveland Clinic, and more). Both lists are extendable on the options page.
How it decides — Vague phrasings like "do i have" are grammar, not medicine, so Dr. No judges queries in tiers: an unambiguously medical term alone ("diabetes"); a body part plus a sensation ("knee hurts"); or a body part plus a question framing ("why does my knee click"). Everyday searches like "why does my car shake" keep working.
Privacy — Runs entirely on your device and makes zero network requests. Collects no data. Stores only your own settings via extension storage.
On Firefox — Dr. No's optional on-device "AI arbiter" for borderline queries relies on Chrome's built-in model, which has no standardized Firefox equivalent, so it's disabled here; borderline queries use the keyword rules alone. All core blocking works fully.
Configure — A toolbar on/off switch, plus an options page for custom terms/sites and picking your ASCII character. Settings sync across your browsers.
Open source (MPL-2.0): https://github.com/garoose/dr-no-medical-search-blocker
Not medical advice, and not a substitute for one. If you're genuinely worried, call a real human doctor.
What it blocks — Medical search queries on Google, Bing, DuckDuckGo, Yahoo, Ecosia, Startpage, Brave, and Qwant; and known medical sites (WebMD, Mayo Clinic, Healthline, Drugs.com, MedlinePlus, NIH, Cleveland Clinic, and more). Both lists are extendable on the options page.
How it decides — Vague phrasings like "do i have" are grammar, not medicine, so Dr. No judges queries in tiers: an unambiguously medical term alone ("diabetes"); a body part plus a sensation ("knee hurts"); or a body part plus a question framing ("why does my knee click"). Everyday searches like "why does my car shake" keep working.
Privacy — Runs entirely on your device and makes zero network requests. Collects no data. Stores only your own settings via extension storage.
On Firefox — Dr. No's optional on-device "AI arbiter" for borderline queries relies on Chrome's built-in model, which has no standardized Firefox equivalent, so it's disabled here; borderline queries use the keyword rules alone. All core blocking works fully.
Configure — A toolbar on/off switch, plus an options page for custom terms/sites and picking your ASCII character. Settings sync across your browsers.
Open source (MPL-2.0): https://github.com/garoose/dr-no-medical-search-blocker
Rated 0 by 0 reviewers
Permissions and data
Required permissions:
- Access your data for all websites
Optional permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.2.0
- Size
- 37.84 KB
- Last updated
- 21 days ago (Jul 26, 2026)
- Related Categories
- License
- Mozilla Public License 2.0
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection