TLSentinel — Chrome Extension

Chrome extension for TLSentinel. See live TLS certificate info for any HTTPS site and manage monitoring directly from your browser.

Features

• Live cert lookup — the extension asks your TLSentinel instance to dial the site in real-time, so you always see the actual certificate, not cached data
• Badge indicator — color-coded badge on the extension icon shows cert status at a glance
• Monitoring status — see whether a site is already monitored in TLSentinel, and add it with one click if not
• Quick navigation — jump straight to the endpoint detail page in TLSentinel

Badge colors

Color	Meaning
🟢 Green	Valid, > 30 days remaining
🟡 Amber	Expiring within 30 days
🔴 Red	Expiring within 7 days or already expired
⚫ Gray	Not an HTTPS page, or TLSentinel unreachable

Requirements

• A running TLSentinel instance
• An API key with at minimum certs:view permission

Setup

1. Build the extension (see below) or load from a release zip
2. In Chrome, go to chrome://extensions, enable Developer mode, click Load unpacked, and select the dist/ folder
3. Click the TLSentinel icon and open Settings via the gear icon
4. Enter your instance URL (e.g. https://tls.example.com) and API key
5. Click Test Connection to verify, then Save

Development

Prerequisites: Node.js 18+

make install   # install dependencies
make build     # production build → dist/
make dev       # watch mode, rebuilds on save
make clean     # remove dist/

After building, reload the extension in chrome://extensions to pick up changes.

Project structure

src/
  api/          API client (talks to TLSentinel server)
  background/   Service worker (badge updates)
  lib/          Badge state, storage helpers
  options/      Settings page
  popup/        Popup UI
public/
  manifest.json
  icons/        Extension icons (16, 32, 48, 128px)