Examine source code of Clipboard URL Normalizer

{
  "manifest_version": 2,
  "name": "Clipboard URL Normalizer",
  "version": "1.1",
  "description": "Normalizes URLs copied to clipboard: decodes percent-encoded characters and re-encodes spaces as %20.",
  "homepage_url": "https://github.com/Jefik37/clipboard-url-normalizer",
  "browser_specific_settings": {
    "gecko": {
      "id": "clipboard-url-normalizer@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "clipboardRead",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  }
}