Examine source code of Dark Sky

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Sky",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(34, 34, 34)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(193, 193, 193)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(34, 222, 158)",
      "popup": "rgb(24, 24, 24)",
      "popup_text": "rgb(219, 219, 219)",
      "button_background_active": "rgb(132, 132, 132)",
      "button_background_hover": "rgb(54, 54, 54)",
      "ntp_background": "rgb(33, 33, 33)",
      "ntp_text": "rgb(219, 219, 219)",
      "popup_border": "rgb(34, 222, 158)",
      "sidebar_border": "rgb(34, 222, 158)",
      "sidebar_highlight_text": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgb(43, 207, 243)",
      "sidebar": "rgb(18, 18, 18)",
      "toolbar_bottom_separator": "rgb(135, 135, 135)",
      "toolbar_field_border_focus": "rgb(34, 222, 158)",
      "toolbar_field_focus": "rgb(49, 47, 47)",
      "toolbar_top_separator": "rgb(135, 135, 135)",
      "tab_loading": "rgb(34, 222, 158)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a373578e-7e85-40fb-bb89-6649a8b9c624}"
    }
  }
}