Examine source code of Tweet Stealer

{
  "description": "Adds an option to easily copy and repost tweets on Twitter with just one click",
  "manifest_version": 2,
  "name": "Tweet Stealer",
  "version": "1.0",
  "homepage_url": "https://github.com/levhita/ratero",
  "icons": {
    "48": "icons/ratero-48.png",
    "96": "icons/ratero-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*"
      ],
      "js": [
        "ratero.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d14a6272-6ea5-455f-a50c-fff8c6f75720}"
    }
  }
}