Examine source code of Twitter Anonymizer

{
  "name": "Twitter Anonymizer",
  "description": "One-click anonymizer of tweets before sharing a screenshot.",
  "version": "1.3.0",
  "manifest_version": 2,
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "https://twitter.com/*",
        "https://mobile.twitter.com/*",
        "https://tweetdeck.twitter.com/*"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "icons": {
    "32": "icon-32.png",
    "64": "icon-64.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a971de62-77f4-4d79-8d7d-926ad217c66f}"
    }
  }
}