Examine source code of Sweet Themes

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Sweet Themes",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(39, 14, 50)",
      "toolbar_text": "rgb(251, 36, 106)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(0, 141, 255)",
      "toolbar_field": "rgb(25, 9, 30)",
      "toolbar_field_text": "rgb(241, 160, 121)",
      "tab_line": "rgb(255, 202, 56)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(98, 102, 183)",
      "button_background_active": "rgb(0, 141, 255)",
      "button_background_hover": "rgba(255, 202, 56, 0.25)",
      "icons": "rgb(0, 141, 255)",
      "ntp_background": "rgb(25, 9, 30)",
      "ntp_text": "rgb(241, 160, 121)",
      "popup_border": "rgb(255, 202, 56)",
      "popup_highlight": "rgb(0, 141, 255)",
      "sidebar_text": "rgb(255, 202, 56)",
      "sidebar": "rgb(25, 9, 30)",
      "tab_background_separator": "rgb(255, 202, 56)",
      "tab_loading": "rgb(0, 141, 255)",
      "toolbar_bottom_separator": "rgba(255, 202, 56, 0.25)",
      "toolbar_field_border_focus": "rgb(251, 36, 106)",
      "toolbar_field_border": "rgb(255, 202, 56)",
      "toolbar_field_highlight_text": "rgba(255, 202, 56, 0.25)",
      "toolbar_field_highlight": "rgba(255, 202, 56, 0.25)",
      "toolbar_field_separator": "rgba(255, 202, 56, 0.25)",
      "toolbar_top_separator": "rgba(255, 202, 56, 0.25)",
      "toolbar_vertical_separator": "rgb(255, 202, 56)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c199f8b-f561-4e9f-855e-6b5530b6b567}"
    }
  }
}