Examine source code of Premium Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Premium Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(22, 22, 65)",
      "toolbar_text": "rgb(241, 241, 241)",
      "frame": "rgb(14, 14, 35)",
      "tab_background_text": "rgb(191, 196, 201)",
      "toolbar_field": "rgb(14, 14, 35)",
      "toolbar_field_text": "rgb(191, 196, 201)",
      "tab_line": "rgba(66, 85, 211, 0.65)",
      "popup": "rgb(22, 22, 65)",
      "popup_text": "rgb(191, 196, 201)",
      "button_background_active": "rgba(56, 77, 208, 0.57)",
      "button_background_hover": "rgba(66, 85, 211, 0.29)",
      "frame_inactive": "rgb(11, 11, 26)",
      "icons_attention": "rgb(66, 85, 211)",
      "icons": "rgb(78, 101, 255)",
      "ntp_background": "rgb(14, 14, 35)",
      "ntp_text": "rgb(191, 196, 201)",
      "popup_border": "rgba(66, 85, 211, 0.65)",
      "popup_highlight_text": "rgb(241, 241, 241)",
      "popup_highlight": "rgba(66, 85, 211, 0.5)",
      "sidebar_border": "rgba(66, 85, 211, 0.65)",
      "sidebar_highlight_text": "rgb(241, 241, 241)",
      "sidebar_highlight": "rgba(66, 85, 211, 0.29)",
      "sidebar_text": "rgb(191, 196, 201)",
      "sidebar": "rgb(22, 22, 65)",
      "tab_background_separator": "rgba(66, 85, 211, 0.65)",
      "tab_loading": "rgb(139, 146, 158)",
      "tab_selected": "rgb(22, 22, 65)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(66, 85, 211, 0.65)",
      "toolbar_field_border_focus": "rgba(66, 85, 211, 0.8)",
      "toolbar_field_border": "rgba(66, 85, 211, 0.65)",
      "toolbar_field_focus": "rgb(17, 17, 49)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(66, 85, 211, 0.7)",
      "toolbar_field_separator": "rgba(66, 85, 211, 0.65)",
      "toolbar_field_text_focus": "rgb(241, 241, 241)",
      "toolbar_top_separator": "rgba(66, 85, 211, 0.65)",
      "toolbar_vertical_separator": "rgba(66, 85, 211, 0.65)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e76bf35-95d0-4ce1-aa5b-dbd07cbeda1e}"
    }
  }
}