Examine source code of Daylight Capture

{
  "manifest_version": 2,
  "name": "Daylight Capture",
  "description": "Share articles to your Daylight Computer",
  "version": "0.4.1",
  "icons": {
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "https://app.daylightcomputer.com/*"
  ],
  "web_accessible_resources": [
    "assets/*.*",
    "auth-callback.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@daylightcomputer.com"
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+D",
        "mac": "MacCtrl+D"
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.daylightcomputer.com/*"
      ],
      "js": [
        "content-scripts/extension-auth.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Send to Daylight (Ctrl+D)"
  }
}