Examine source code of Euromaster

{
  "manifest_version": 2,
  "name": "Euromaster",
  "version": "1.2.12",
  "description": "Euromaster",
  "web_accessible_resources": [
    "images/euromaster/icon.png"
  ],
  "content_scripts": [
    {
      "run_at": "document_idle",
      "all_frames": true,
      "css": [
        "styles.css"
      ],
      "js": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "contextMenus",
    "<all_urls>"
  ],
  "background": {
    "page": "background.html"
  },
  "icons": {
    "16": "images/euromaster/icon.png",
    "48": "images/euromaster/icon.png",
    "128": "images/euromaster/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{39536cbc-1f0e-4ae8-8812-0eb6673e6aa6}"
    }
  }
}