Examine source code of Unlock Pixnet

{
  "manifest_version": 2,
  "name": "Unlock Pixnet",
  "version": "1.1resigned1",
  "description": "Anti disabled right click and release contextmenu in Pixnet.net",
  "icons": {
    "48": "unlock.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.pixnet.net/blog/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3476d0f8-7088-4dc7-8216-bc32bde50f98}"
    }
  }
}