Examine source code of DNDEmail - Do Not Disturb for Gmail™

{
  "name": "__MSG_appName__",
  "version": "1.6.4resigned1",
  "manifest_version": 2,
  "description": "__MSG_appDescription__",
  "short_name": "__MSG_shortName__",
  "homepage_url": "https://dndemail.com",
  "icons": {
    "16": "images/icon-16.png",
    "128": "images/icon-128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "scripts/jquery-2.1.4.js",
      "scripts/background.js",
      "scripts/ga.js"
    ]
  },
  "permissions": [
    "https://*/*",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "scripts/jquery-2.1.4.js",
        "scripts/bootstrap.min.js",
        "scripts/jquery.timepicker.min.js",
        "scripts/jstz.min.js",
        "scripts/contentscript.js"
      ],
      "css": [
        "styles/main.css",
        "styles/settings.css",
        "styles/jquery.timepicker.min.css"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "browser_action": {
    "default_title": "Launch Gmail with DNDEmail enabled."
  },
  "web_accessible_resources": [
    "settings.html",
    "images/*.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{322f6062-26b9-4122-9dd1-b19231b6beb9}"
    }
  }
}