Examine source code of Stack Exchange Post Watcher

{
  "name": "Stack Exchange Post Watcher",
  "version": "1.2.1",
  "manifest_version": 2,
  "description": "Watch questions & answers on the Stack Exchange network of sites to find out when they are edited, commented on, answered, and more!",
  "homepage_url": "http://github.com/shu8",
  "icons": {
    "16": "icons/logo-16.png",
    "19": "icons/logo-19.png",
    "24": "icons/logo-24.png",
    "32": "icons/logo-32.png",
    "48": "icons/logo-48.png",
    "64": "icons/logo-64.png",
    "128": "icons/logo-128.png"
  },
  "background": {
    "scripts": [
      "src/browser-polyfill.min.js",
      "src/background/constants.js",
      "src/background/helpers.js",
      "src/background/API.js",
      "src/background/postChangeDetector.js",
      "src/background/background.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "16": "icons/logo-16.png",
      "19": "icons/logo-19.png",
      "24": "icons/logo-24.png",
      "32": "icons/logo-32.png",
      "48": "icons/logo-48.png",
      "64": "icons/logo-64.png",
      "128": "icons/logo-128.png"
    },
    "default_title": "Stack Exchange Post Watcher",
    "default_popup": "src/pageAction/pageAction.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "alarms",
    "notifications",
    "*://*.stackoverflow.com/*",
    "*://*.stackexchange.com/*",
    "*://*.superuser.com/*",
    "*://*.serverfault.com/*",
    "*://*.askubuntu.com/*",
    "*://*.stackapps.com/*",
    "*://*.mathoverflow.net/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.stackoverflow.com/*",
        "*://*.stackexchange.com/*",
        "*://*.superuser.com/*",
        "*://*.serverfault.com/*",
        "*://*.askubuntu.com/*",
        "*://*.stackapps.com/*",
        "*://*.mathoverflow.net/*"
      ],
      "css": [
        "src/contentScript/contentScript.css"
      ],
      "js": [
        "src/dialog-polyfill.js",
        "src/browser-polyfill.min.js",
        "src/background/constants.js",
        "src/background/helpers.js",
        "src/contentScript/contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "stack-exchange-post-watcher@extension.com"
    }
  }
}