Examine source code of Fire Horizon

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fire Horizon",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.1)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(35, 35, 35)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "icons": "rgb(255, 255, 255)",
      "popup_highlight": "rgba(0, 0, 0, 0.4)",
      "sidebar_border": "rgba(0, 0, 0, 0.5)",
      "tab_loading": "rgba(255, 255, 255, 0.3)",
      "tab_selected": "rgba(255, 255, 255, 0.3)",
      "toolbar_field_border_focus": "rgb(143, 143, 143)",
      "toolbar_field_border": "rgba(255, 255, 255, 0.3)",
      "toolbar_field_focus": "rgba(58, 58, 58, 0.95)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(14, 145, 200, 0.8)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "toolbar_vertical_separator": "rgba(255, 255, 255, 0.5)"
    }
  }
}