Examine source code of Marc Ecko - Dark Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Marc Ecko - Dark Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top",
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(112, 112, 112)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(95, 95, 95)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(95, 95, 95)",
      "popup": "rgb(41, 42, 45)",
      "popup_text": "rgb(226, 226, 226)",
      "icons_attention": "rgba(174, 203, 250, 0.9)",
      "ntp_background": "rgb(78, 78, 78)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "tab_selected": "rgba(0, 0, 0, 0.53)",
      "toolbar_bottom_separator": "rgb(140, 140, 140)",
      "toolbar_field_border_focus": "rgba(174, 203, 250, 0.58)",
      "toolbar_field_focus": "rgb(32, 33, 36)",
      "toolbar_field_highlight": "rgba(1, 96, 255, 0.58)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(95, 95, 95)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f4d2be2-73ea-48da-b27e-b4d9b1145041}"
    }
  }
}