Examine source code of Anime Sama Style

{
  "manifest_version": 3,
  "name": "Anime Sama Style",
  "version": "1.0",
  "description": "Modifier le style Anime Sama, une extension non officielle",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://anime-sama.fr/*"
      ],
      "js": [
        "background.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "action": {
    "default_icon": "icon.png",
    "default_title": "Anime Sama Style"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "oxidev@perso.be",
      "strict_min_version": "42.0"
    }
  }
}