Prevents users from opening potentially dangerous or unwanted local file types (e.g., .html, .js) in the browser, typically used as a security/policy enforcement tool in enterprise environments

An administrator configures blocked file extensions via Chrome managed storage policy (e.g., {"blocktypes": ["html", "js"]}). When any user on the managed device attempts to open a local file with a blocked extension via file:// URL, the extension automatically closes the tab and shows a blocking message page.

Target users: Enterprise IT administrators / Organizations enforcing browser security policies on managed Chrome devices

Extension is very small (90 lines in background.js) with straightforward logic, making analysis highly reliable

Monetization

No paid features detected

No payment, billing, subscription, upgrade, or premium feature code exists. The keyword hits for 'license' are Apache 2.0 boilerplate comments, and 'pro' matches are from 'Promise' and 'properties' — not paid feature references. The extension is a simple admin-configured blocker with no gating of functionality behind payment.

Confidence: 95
Payment platform: --
Source: AI / High
Login required: No
Reason: The extension has no login UI, no authentication flows, no account system, and no external service calls requiring credentials. It operates entirely using Chrome's local and managed storage APIs with no user-facing authentication.

Permission risk

Medium-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage、tabs

Publisher

Clay

Independent publisher

Email: [email protected]
Phone: --
Address: --

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Permissions

Host access