Examine source code of Autoheal

{
  "manifest_version": 2,
  "name": "Autoheal",
  "author": "ShinoBot",
  "version": "1.2.0",
  "description": "Vous soignez n'aura jamais autant facile.",
  "content_scripts": [
    {
      "matches": [
        "*://www.shinobi.fr/index.php?page=combat_guerre",
        "*://m.shinobi.fr/index.php?page=combat_guerre"
      ],
      "js": [
        "autoheal.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9161ebae-2ead-4774-8e7d-466e59865c82}"
    }
  }
}