Examine source code of TweeterDownloader – X Video & Image Download

{
  "manifest_version": 3,
  "name": "TweeterDownloader – X Video & Image Download",
  "version": "1.0.3",
  "description": "Download videos, images & GIFs from X.com (Twitter) with one click. Works on feed, profiles & Promoted Ads.",
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tweeterdownloader@tweeterdownloader.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs"
  ],
  "host_permissions": [
    "*://*.twitter.com/*",
    "*://*.x.com/*"
  ],
  "action": {
    "default_title": "Download from X",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icon16.png",
      "48": "assets/icon48.png",
      "128": "assets/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "js": [
        "content/main-world.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "css": [
        "content/content.css"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle",
      "world": "ISOLATED"
    }
  ]
}