Examine source code of FixAdrena

{
  "name": "FixAdrena",
  "version": "1.0.4resigned1",
  "description": "Cansado de users rebeldes que mudam a cor do texto do post? Pois é...",
  "manifest_version": 2,
  "minimum_chrome_version": "49",
  "permissions": [
    "activeTab",
    "storage",
    "http://adrenaline.uol.com.br/forum/*"
  ],
  "icons": {
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "http://adrenaline.uol.com.br/forum/*"
      ],
      "js": [
        "fix-adrena.js",
        "prefix-free.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e7ebd06-b1b3-4980-b49f-25ef4ed1224a}"
    }
  }
}