Examine source code of Le SEUM

{
  "manifest_version": 2,
  "name": "Le SEUM",
  "version": "1.1resigned1",
  "description": "Remplace le mot SEUM par le drapeau de la belgique",
  "icons": {
    "48": "be.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "seum.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb4e42b4-c473-4049-a8e0-cb2e31897330}"
    }
  }
}