Examine source code of Twitter Mass Unfollow

{
  "name": "Twitter Mass Unfollow",
  "short_name": "massunfollow",
  "description": "A simple (configurable) way to mass unfollow your Twitter followings. It will save a list of unfollowed @s after finished!",
  "version": "1.1.7",
  "manifest_version": 3,
  "icons": {
    "16": "images/16.png",
    "32": "images/32.png",
    "48": "images/48.png",
    "128": "images/128.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.twitter.com/*/following"
      ],
      "js": [
        "script.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "shared.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "storage",
    "declarativeContent",
    "scripting",
    "activeTab"
  ],
  "background_scripts": [
    {
      "name": "background",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "background.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "massunfollow@fork.plasmmer.com",
      "strict_min_version": "109.0"
    }
  }
}