Browser Sentinel

About

Browser Sentinel gives you complete visibility into what your browser is doing behind the scenes — every request, every extension, every server your data touches.

HOW IT WORKS

1. Load the extension — it immediately begins intercepting all browser network requests
2. Click the icon for a quick summary of alerts, unencrypted connections, and flagged extensions
3. Open the full dashboard for deep inspection of traffic and installed extensions
4. Receive notifications when an extension contacts a server it never declared permission for

TRAFFIC MONITOR

Every request your browser makes — from every tab and every extension — is logged and analysed in real time:

- Protocol: HTTPS (encrypted) vs HTTP (plaintext/exposed) flagged immediately
- Destination: hostname, resolved IP address, hosting provider and country
- CDN/Proxy detection: identifies servers hidden behind Cloudflare, Amazon CloudFront, Fastly, Akamai and more
- Source identification: which tab or which extension initiated each request
- Filterable by protocol, source type, CDN status, and free-text search

EXTENSION AUDITOR

Every installed Chrome extension is listed alongside its declared host_permissions from its manifest:

- See exactly which domains each extension is allowed to contact
- Any request to a domain NOT listed in the extension's declared permissions is flagged as UNDECLARED
- Extensions with <all_urls> permission are highlighted — these can contact any server
- Request counts per extension reveal which extensions are most active
- Instant notification when an extension phones home to an undeclared server

ALERTS

A dedicated alerts view consolidates all findings:

- Undeclared extension requests — extension contacted a server beyond its stated permissions
- Unencrypted connections — data sent in plaintext over HTTP
- Hidden servers — destination is masked behind a CDN or reverse proxy

WHO IS IT FOR

- Privacy-conscious users who want to know what data their browser is sending and where
- Security researchers auditing the behaviour of installed Chrome extensions
- IT administrators checking for rogue extensions on managed devices
- Developers verifying their own extensions only contact declared servers
- Anyone curious whether their extensions are doing more than they claim

PRIVACY

- No data is collected, stored, or transmitted by this extension
- All monitoring happens locally in your browser — nothing leaves your device
- Traffic logs are held in memory only and cleared on demand
- No analytics, no telemetry, no external servers

Built by Cosmos Web Tech — Digital Solutions for Sydney Businesses