Examine source code of SteelBlue Theme

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "steelblue-theme@mnp",
      "strict_min_version": "58.0"
    }
  },
  "name": "SteelBlue Theme",
  "version": "3.0",
  "description": "SteelBlue theme for Firefox",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "theme": {
    "colors": {
      "tab_line": "rgb(0, 0, 0)",
      "tab_loading": "#545959",
      "icons_attention": "#78DBE2",
      "icons": "#5F9EA0",
      "toolbar": "#2b2b2b",
      "toolbar_top_separator": "#151515",
      "toolbar_bottom_separator": "#151515",
      "toolbar_vertical_separator": "#151515",
      "toolbar_field": "rgba(0,0,0,0.95)",
      "toolbar_field_text": "#00BFFF",
      "toolbar_field_focus": "rgb(0,0,0)",
      "toolbar_field_border": "rgb(0,0,0)",
      "toolbar_field_separator": "rgba(85,85,85,.3)",
      "toolbar_field_border_focus": "#2a2b2c",
      "button_background_hover": "#787878",
      "button_background_active": "#545959",
      "popup": "#2b2b2b",
      "popup_text": "#77DDE7",
      "popup_border": "#8a6200",
      "popup_highlight": "#545959",
      "popup_highlight_text": "#E3EAF3",
      "ntp_text": "#D3DAE3",
      "ntp_background": "#303030",
      "sidebar": "#2b2b2b",
      "sidebar_text": "#D3DAE3",
      "sidebar_border": "#2B2E39",
      "sidebar_highlight": "#5294E2",
      "sidebar_highlight_text": "#E3EAF3",
      "tab_background_text": "#00BFFF",
      "frame": "rgba(0, 0, 0, 1)",
      "bookmark_text": "#00BFFF"
    }
  }
}