Examine source code of Social Media Ad-Block

{
  "manifest_version": 2,
  "name": "Social Media Ad-Block",
  "version": "1.3.1",
  "description": "This add-on will block any advertisiment in your social network. Implemented: Twitter.",
  "icons": {
    "32": "icons/favicon_32.ico"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "ad-block.js"
      ],
      "run_at": "document_idle",
      "web_accessible_resources": [
        "resources/twitter-white-icon.png",
        "resources/twitter-dark-icon.png"
      ],
      "browser_action": {
        "default_icon": {
          "32": "twitter-dark-toolbar-icon-32.png",
          "64": "twitter-dark-toolbar-icon-64.png",
          "128": "twitter-dark-toolbar-icon-128.png",
          "512": "twitter-dark-toolbar-icon-512.png"
        }
      }
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e04cea2a-6690-48d5-b68f-ca859bd1a498}"
    }
  }
}