Examine source code of Griglia

{
  "name": "Griglia",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Grid Metal 2nd.jpg"
    },
    "colors": {
      "frame": "rgba(135, 133, 133, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(66, 70, 87, 0.63)",
      "toolbar_field": "rgba(0, 0, 0, 0.55)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{78393831-9ada-4490-bacd-26e10e804f42}"
    }
  }
}