Examine source code of RedirectNixWiki

{
  "manifest_version": 2,
  "name": "RedirectNixWiki",
  "version": "1.0",
  "description": "Redirects old nixos.wiki to the official wiki.nixos.org.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://nixos.wiki/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "redirect-nix-wiki@undesided.me"
    }
  },
  "icons": {
    "48": "icons/nixos-48.png",
    "96": "icons/nixos-96.png"
  }
}