Examine source code of Showdown FR

{
  "manifest_version": 2,
  "name": "Showdown FR",
  "version": "1.3",
  "description": "Traduction française de Pokemon Showdown.",
  "icons": {
    "128": "icons/bn128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon2.png",
    "default_popup": "popup/popup.html",
    "default_title": "SFR"
  },
  "content_scripts": [
    {
      "matches": [
        "*://play.pokemonshowdown.com/*",
        "*://*.psim.us/*",
        "*://replay.pokemonshowdown.com/*"
      ],
      "js": [
        "production.min.js",
        "content.js"
      ]
    },
    {
      "matches": [
        "*://play.pokemonshowdown.com/teambuilder*",
        "*://*.psim.us/teambuilder*"
      ],
      "js": [
        "inject_script.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "production.min.js",
    "teambuilder.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "showdown.fr@gmail.com"
    }
  }
}