Examine source code of Original Birds

{
  "manifest_version": 3,
  "name": "Original Birds",
  "version": "0.0.0.5",
  "description": "An extension that shows green checkmarks next to legacy verified Twitter users.",
  "homepage_url": "https://chromestone.github.io/OriginalBirds/",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.twitter.com/*"
      ],
      "js": [
        "scripts/purify.js",
        "scripts/content.js"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "action": {
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "128": "images/icon-128.png"
    },
    "default_title": "Original Birds",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "open.birds.official@gmail.com"
    }
  }
}