Examine source code of MediaGrab

{
  "manifest_version": 2,
  "name": "MediaGrab",
  "description": "Download photos, videos and GIFs from X (Twitter) posts.",
  "version": "4.0.0",
  "author": "ostnr",
  "homepage_url": "https://github.com/ostnr/MediaGrab",
  "browser_specific_settings": {
    "gecko": {
      "id": "mediagrab@ostnr.github.io",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "*://x.com/*",
    "*://*.x.com/*",
    "*://twitter.com/*",
    "*://*.twitter.com/*",
    "*://*.twimg.com/*",
    "*://video.twimg.com/*",
    "storage",
    "downloads",
    "tabs"
  ],
  "icons": {
    "16": "icon_bitty.png",
    "48": "icon_small.png",
    "96": "icon_medium.png",
    "128": "icon_large.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://mobile.twitter.com/*",
        "*://x.com/*",
        "*://*.x.com/*"
      ],
      "css": [
        "twitter_video_assist_client.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://twitter.com/*",
        "*://mobile.twitter.com/*",
        "*://x.com/*",
        "*://*.x.com/*"
      ],
      "css": [
        "twitter_video_assist_client.css"
      ],
      "js": [
        "browser-polyfill.min.js",
        "jquery-3.3.1.min.js",
        "inject.js",
        "twitter_video_assist_client.js",
        "twitter_video_downloader.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "inject.js",
    "twitter_video_downloader.js"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "inject.js",
      "twitter_video_downloader.js",
      "content.js",
      "twitter_video_assist_server.js"
    ]
  }
}