Examine source code of GrayShades222ThemeForDeveloper

{
  "name": "GrayShades222ThemeForDevelopers",
  "manifest_version": 2,
  "version": "89.19",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "0.png",
        "1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_tiling": [
        "no-repeat",
        "repeat-x"
      ],
      "additional_backgrounds_alignment": [
        "right top",
        "right top"
      ]
    },
    "colors": {
      "bookmark_text": "#fff",
      "icons": "#fff",
      "frame": "#222",
      "ntp_background": "#222",
      "ntp_text": "#fff",
      "popup": "#222",
      "popup_border": "#222",
      "popup_highlight": "#333",
      "popup_highlight_text": "#D5D5D5",
      "popup_text": "#D5D5D5",
      "sidebar": "#222",
      "sidebar_border": "#222",
      "sidebar_highlight": "#222",
      "sidebar_highlight_text": "#D5D5D5",
      "sidebar_text": "#D5D5D5",
      "tab_background_text": "#fff",
      "tab_line": "#f008",
      "tab_selected": "#fff8",
      "tab_text": "#f00",
      "toolbar": "#2224",
      "toolbar_field": "#00b2b255",
      "toolbar_field_focus": "#00b2b2",
      "toolbar_field_highlight": "#333",
      "toolbar_field_highlight_text": "#fff",
      "toolbar_field_text": "#fff",
      "toolbar_field_text_focus": "#fff",
      "toolbar_text": "#fff",
      "toolbar_field_border": "rgba(0, 0, 0, 0)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cafe85f0-03b0-44c4-8093-d1b5629c0a04}"
    }
  }
}