Examine source code of Tweet Scroller

{
  "manifest_version": 2,
  "name": "Tweet Scroller",
  "version": "1.0.0",
  "description": "Navigate tweets one by one on X.com using the spacebar. Press Space for next tweet, Shift+Space for previous.",
  "author": "Nikita",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://x.com/*",
        "*://twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "tweet-scroller@example.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}