Beta tool 2026
Web Firewall
Privacy-first Chrome extension for safer browsing — hides low-quality content, detects scam/dark pattern UI, and warns about prompt injection attacks targeting AI agents. Runs entirely locally.
Chrome ExtensionManifest V3JavaScriptContent Scripts
01 Details
About the Project
Web Firewall is a Chrome extension (Manifest V3) that provides three layers of protection while browsing. Everything runs locally — no page content is ever sent to external servers.
Problem
Modern websites are full of hidden manipulative elements: fake download buttons, aggressive overlay ads, dark patterns, and even prompt injection attacks targeting AI agents and scrapers. Regular users can't see these threats.
3 Protection Layers
- Quality Shield (Noise Canceling) — automatically identifies and hides low-value content blocks: "related articles", aggressive CTAs, boilerplate. Preserves main content and navigation.
- Scam Shield — detects fake download buttons, dark pattern overlays, interstitials, and clickfix patterns (PowerShell/terminal bait). Optional click-guard for high-risk elements.
- Injection Shield — detects hidden text targeting AI agents/scrapers, prompt injection phrases, "agent bait" (requests for tokens, keys, clipboard access), and suspicious content in aria-label/alt/title/meta attributes.
Modes
- Off — extension disabled for this site
- Clean — light filtering, preserves most content
- Focus — moderate filtering, hides sidebars and distractions
- Strict — aggressive filtering, click-guards on risky elements
Design Principles
- Local-first — all analysis runs in content scripts, no server calls (Free mode)
- Safe by design — minimal permissions, no eval, no remote code
- Fast — non-blocking, incremental analysis with debounced observers (< 150ms CPU)
- Reversible — user can restore any hidden content
- Explainable — all decisions include reasons and scores
The extension is in beta stage, preparing for Chrome Web Store release.