Examine source code of Reddit App Helper

{
  "manifest_version": 3,
  "name": "Reddit App Helper",
  "version": "0.7",
  "description": "Displays a QR code next to the client ID/API key on the Reddit apps page and Giphy developers dashboard.",
  "icons": {
    "128": "assets/logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reddit-app-helper@cygnusx-1.org",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "scripting",
    "tabs",
    "webNavigation"
  ],
  "host_permissions": [
    "https://www.reddit.com/prefs/apps*",
    "https://old.reddit.com/prefs/apps*",
    "https://developers.giphy.com/dashboard/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "qr-creator.js"
      ],
      "matches": [
        "https://www.reddit.com/*",
        "https://old.reddit.com/*",
        "https://developers.giphy.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "qr-creator.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.reddit.com/prefs/apps*",
        "https://old.reddit.com/prefs/apps*",
        "https://developers.giphy.com/dashboard*"
      ],
      "js": [
        "qr-creator.js",
        "content.js"
      ]
    }
  ]
}