Examine source code of Ad-Blacker

{
  "manifest_version": 2,
  "name": "Ad-Blacker",
  "version": "1.0",
  "description": "Blacks-out ads on popular video streaming websites",
  "icons": {
    "48": "icons/48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "ad-blacker.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{25124d56-fa63-470c-aaf7-35240fb89bf5}"
    }
  }
}