Examine source code of Pinterest Downloader

{
  "manifest_version": 2,
  "name": "Pinterest Downloader",
  "version": "1.2",
  "description": "Adds download button for pins.",
  "author": "Sekiju",
  "icons": {
    "32": "icons/32x.png"
  },
  "permissions": [
    "tabs",
    "downloads"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.pinterest.com/*",
        "*://*.pinterest.ca/*",
        "*://*.pinterest.ph/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{00a4ddd6-ab3b-4bf7-a424-6761177fc4d5}"
    }
  }
}