Examine source code of Horizon Farm

{
  "name": "Horizon Farm",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "HorizonFarmH.jpg"
    },
    "colors": {
      "frame": "rgba(242, 209, 89, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(245, 217, 90, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(67, 87, 16, 0.08)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9145570a-6e71-48ce-9cd2-d212feedc446}"
    }
  }
}