Examine source code of BGM

{
  "description": "Permet de retrouver les donnees du système BGM depuis les ISBNs disponibles dans les pages.",
  "manifest_version": 2,
  "name": "BGM v2",
  "version": "1.0.15",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "bgm.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_icon": "icon16.png",
    "default_title": "BGM",
    "default_popup": "options.html"
  },
  "permissions": [
    "*://*.gminvent.fr/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "bgm@gminvent.fr"
    }
  }
}