Examine source code of X Video Downloader

{
  "manifest_version": 2,
  "name": "X Video Downloader",
  "version": "1.3.0",
  "description": "One-click download button on every x.com (Twitter) post with a video. Best-quality MP4, presets or pixel-perfect button placement, dark and light themes.",
  "author": "Sneg",
  "developer": {
    "name": "Sneg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "x-video-downloader@sneg",
      "strict_min_version": "102.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "downloads",
    "webRequest",
    "*://x.com/*",
    "*://*.x.com/*",
    "*://twitter.com/*",
    "*://*.twitter.com/*",
    "*://*.twimg.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://x.com/*",
        "*://twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "X Video Downloader",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "64": "icons/icon64.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}