Examine source code of Live Reload — monitor and reload html, css, js

{
  "manifest_version": 2,
  "name": "Live Reload",
  "version": "1.8.4",
  "description": "Monitors source files on a page. Reloads the page or just the changed stylesheet when source files are updated.",
  "homepage_url": "https://github.com/blaise-io/live-reload#readme",
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs",
    "webNavigation",
    "webRequest"
  ],
  "applications": {
    "gecko": {
      "id": "live-reload@blaise.io"
    }
  },
  "background": {
    "scripts": [
      "/background.js"
    ]
  },
  "icons": {
    "128": "/icons/icon.png"
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": "/icons/icon.png",
    "default_popup": "/popup.html"
  },
  "options_ui": {
    "page": "/options.html",
    "browser_style": true
  }
}