Examine source code of TRPL Redirect

{
  "name": "TRPL Redirect",
  "short_name": "trpl-redirect",
  "description": "Redirect outdated links to The Rust Programming Language book to the right URLs",
  "manifest_version": 2,
  "version": "1.0.1resigned1",
  "author": "Srishan Bhattarai",
  "homepage_url": "https://github.com/srishanbhattarai/trpl-redirect",
  "content_scripts": [
    {
      "matches": [
        "https://doc.rust-lang.org/book/second-edition/*"
      ],
      "js": [
        "./build.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{542c2ef4-a1de-4344-b1dd-2959d094f021}"
    }
  }
}