Examine source code of purple-grid

{
  "name": "purple grid",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "grid3.png"
    },
    "colors": {
      "frame": "rgba(101, 114, 194, 1)",
      "tab_background_text": "rgba(37, 18, 97, 1)",
      "toolbar": "rgba(162, 163, 219, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(225, 225, 250, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1d82be7-63ba-46c8-9453-670b7653ddaa}"
    }
  }
}