Examine source code of Text Copy

{
  "manifest_version": 2,
  "name": "Text Copy",
  "version": "1.0",
  "description": "Copy input text to the clipboard for easy pasting.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9121f768-e42c-4cf9-b4d3-47959e931aec}"
    }
  }
}