Examine source code of Black Fox purple

{
  "name": "Black Fox purple",
  "author": "Nac110",
  "manifest_version": 2,
  "version": "1.1",
  "description": "Black theme with Firefox's purple and orange accent colours and Firefox logo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/firefox_bw_logo.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "frame": "black",
      "frame_inactive": "black",
      "tab_text": "white",
      "tab_background_text": "white",
      "tab_background_separator": "rgba(255, 255, 255, 0)",
      "tab_selected": "rgb(37,15,79)",
      "tab_line": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(243, 48, 14)",
      "icons_attention": "rgb(243, 48, 14)",
      "toolbar": "rgb(25, 25, 25)",
      "toolbar_top_separator": "rgb(20, 20, 20)",
      "toolbar_bottom_separator": "rgb(20, 20, 20)",
      "toolbar_vertical_separator": "rgb(180, 180, 180)",
      "toolbar_field": "rgb(10, 10, 10)",
      "toolbar_field_text": "white",
      "toolbar_field_border": "rgb(10, 10, 10)",
      "toolbar_field_highlight": "rgb(37,15,79)",
      "toolbar_field_focus": "rgb(15, 15, 15)",
      "toolbar_field_border_focus": "rgb(15, 15, 15)",
      "button_background_hover": "rgba(255, 255, 255, 0.1)",
      "button_background_active": "rgba(255, 255, 255, 0.15)",
      "icons": "white",
      "bookmark_text": "white",
      "popup": "rgb(20, 20, 20)",
      "popup_text": "white",
      "popup_border": "rgb(20, 20, 20)",
      "popup_highlight": "rgb(19,7,40)",
      "popup_highlight_text": "white",
      "ntp_background": "rgb(20, 20, 20)",
      "ntp_text": "white",
      "sidebar": "rgb(30, 30, 30)",
      "sidebar_text": "white",
      "sidebar_border": "rgb(35, 35, 35)",
      "sidebar_highlight": "rgb(116,22,6)",
      "sidebar_highlight_text": "white"
    }
  }
}