Examine source code of DivusX - Color Picker

{
  "manifest_version": 2,
  "name": "DivusX - Color Picker",
  "description": "This is the color picker tool from the DivusX platform for your browser.",
  "version": "0.0.1",
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "img/logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74312c79-e39c-4095-8323-6fabf6d28ad9}"
    }
  }
}