Examine source code of Good Thinking

{
  "name": "Good Thinking",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "rs_w_100_.jpg"
    },
    "colors": {
      "frame": "rgba(255, 179, 0, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(21, 21, 21, 1)",
      "bookmark_text": "rgba(255, 179, 0, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ba793d3-81f8-40aa-822d-972fd47e64a7}"
    }
  }
}