Examine source code of Warframe light

{
  "name": "Warframe",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "warframe.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "ntp_background": "white",
      "ntp_text": "black",
      "tab_background_text": "black",
      "tab_line": "black",
      "frame": "white",
      "frame_inactive": "gray",
      "tab_text": "black",
      "icons": "black",
      "toolbar": "rgba(255, 255, 255, 0.5)",
      "toolbar_field_border": "black",
      "toolbar_field": "white",
      "toolbar_field_text": "black",
      "toolbar_field_highlight_text": "black",
      "toolbar_field_highlight": "gray",
      "bookmark_text": "black",
      "popup": "white",
      "popup_text": "black",
      "popup_border": "black",
      "popup_highlight": "gray",
      "tab_loading": "gray",
      "ntb_text": "black",
      "ntb_background": "white",
      "sidebar": "white",
      "sidebar_border": "black",
      "sidebar_text": "black",
      "sidebar_highlight": "gray",
      "sidebar_highlight_text": "white"
    }
  }
}