Examine source code of Shiro

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "Shiro-theme@stereh",
      "strict_min_version": "67.0"
    }
  },
  "name": "Shiro",
  "version": "1.1",
  "description": "Shiro theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "colors": {
      "frame": "rgb(16, 30, 42)",
      "frame_inactive": "rgb(16, 30, 42)",
      "tab_text": "rgb(221, 237, 248)",
      "tab_background_text": "rgb(174, 188, 195)",
      "tab_line": "rgb(221, 238, 249)",
      "tab_loading": "rgb(221, 238, 249)",
      "tab_background_separator": "rgb(221, 238, 249)",
      "icons": "rgb(174, 188, 195)",
      "icons_attention": "#732C32",
      "toolbar": "rgba(20, 27, 32, 0.5)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0)",
      "toolbar_vertical_separator": "rgba(221, 238, 249, 0.4)",
      "toolbar_field": "rgba(213, 226, 234, 0.03)",
      "toolbar_field_text": "rgb(166, 179, 186)",
      "toolbar_field_text_focus": "rgb(221, 237, 248)",
      "toolbar_field_border": "rgba(213, 226, 234, 0)",
      "toolbar_field_separator": "rgb(166, 179, 186)",
      "toolbar_field_focus": "rgba(33, 44, 52, 0.7)",
      "toolbar_field_border_focus": "rgba(115, 44, 50, 0.5)",
      "toolbar_field_highlight": "rgba(117, 145, 162, 0.5)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255, 0.9)",
      "button_background_hover": "rgba(117, 145, 162, 0.2)",
      "button_background_active": "rgba(67, 89, 108, 0.8)",
      "bookmark_text": "rgb(221, 237, 248)",
      "popup": "rgb(24, 32, 40)",
      "popup_text": "rgb(211, 218, 227)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "popup_highlight": "rgb(57, 79, 98)",
      "popup_highlight_text": "rgba(255, 255, 255, 0.9)",
      "sidebar": "rgb(24, 32, 40)",
      "sidebar_text": "rgb(211, 218, 227)",
      "sidebar_border": "rgba(0, 0, 0, 0)",
      "sidebar_highlight": "rgb(57, 79, 98)",
      "sidebar_highlight_text": "rgba(255, 255, 255, 0.9)",
      "ntp_text": "rgb(220, 218, 233)",
      "ntp_background": "#101E2A"
    }
  }
}