Examine source code of Gum Gum Streaming

{
  "browser_specific_settings": {
    "gecko": {
      "id": "gum@gum-gum-streaming.com"
    }
  },
  "manifest_version": 2,
  "name": "Gum Gum Streaming",
  "version": "1.0.0.3",
  "author": "Gum Gum Streaming",
  "description": "Résultats de recherche par Gum Gum Streaming",
  "permissions": [
    "activeTab",
    "storage",
    "*://*/"
  ],
  "icons": {
    "48": "icons/48x48.png",
    "96": "icons/96x96.png",
    "128": "icons/128x128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "js/gs.js"
      ],
      "matches": [
        "*://gum-gum-streaming.com/*",
        "*://gum-gum-anime.com/*",
        "*://gum-gum-manga.com/*"
      ],
      "run_at": "document_start"
    },
    {
      "css": [
        "css/main.css"
      ],
      "js": [
        "js/main.js"
      ],
      "matches": [
        "https://www.google.com/*",
        "https://www.google.be/*",
        "https://www.google.fr/*"
      ],
      "run_at": "document_start"
    }
  ]
}