Examine source code of Send to Protouch

{
  "name": "Send to Protouch",
  "description": "Protouch makes professional image post-processing trivial.",
  "version": "1.0",
  "permissions": [
    "contextMenus",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "script.js"
  ],
  "manifest_version": 2,
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "*://instant.protou.ch/*"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}