Examine source code of linkopier

{
  "manifest_version": 2,
  "name": "linkopier",
  "version": "1.0",
  "description": "Copy url/link under cursor to clipboard.",
  "icons": {
    "48": "icons/icon@0.5x.png",
    "96": "icons/icon.png"
  },
  "permissions": [
    "clipboardWrite",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "find-link.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "linkopier@solovyov.net"
    }
  }
}