Examine source code of Color Picker & Copier

{
  "manifest_version": 2,
  "name": "Color Picker & Copier",
  "version": "1.0",
  "description": "Pick a color and copy its hex code to the clipboard.",
  "permissions": [
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": "icons/color-picker-48.png",
    "default_popup": "popup.html",
    "default_title": "Color Picker"
  },
  "icons": {
    "48": "icons/color-picker-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b76ad3ec-e98d-4ee6-ad7e-73cb05bc435a}"
    }
  }
}