Examine source code of Fix Discord CDN

{
  "manifest_version": 3,
  "name": "Fix Discord CDN",
  "description": "Download expired Discord CDN files!",
  "version": "1.1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "fix-discord-cdn@hyonsu.com"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "scripts/fixcdn.js"
      ],
      "run_at": "document_start",
      "matches": [
        "https://cdn.discordapp.com/attachments/*/*/*",
        "https://media.discordapp.net/attachments/*/*/*"
      ]
    }
  ]
}