Examine source code of Copy Relative URL

{
  "manifest_version": 2,
  "name": "Copy Relative URL",
  "description": "A very simple extension to copy the relative path of a URL",
  "version": "1.0",
  "homepage_url": "https://github.com/cody1213/copy-relative-url",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5929e94-34ea-41bc-809b-8de8a0428ca1}"
    }
  }
}