Examine source code of Gradient

{
  "manifest_version": 2,
  "version": "0.1",
  "name": "Gradient",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/4.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ]
    },
    "colors": {
      "bookmark_text": "rgb(255, 255, 255,1)",
      "button_background_active": "rgba(0, 0, 0,1)",
      "button_background_hover": "rgba(0, 0, 255,1)",
      "frame": "rgba(0, 0, 0,0)",
      "frame_inactive": "rgba(0, 0, 0,0)",
      "icons": "rgba(255, 0, 0,1)",
      "icons_attention": "rgba(255, 255, 255,1)",
      "ntp_background": "rgba(0, 0, 0,1)",
      "ntp_text": "rgba(255, 255, 255,1)",
      "popup": "rgba(0, 0, 0,1)",
      "popup_border": "rgba(255, 0, 0,0.8)",
      "popup_highlight": "rgba(0, 0, 255,1)",
      "popup_highlight_text": "rgba(255, 255, 255,1)",
      "popup_text": "rgba(255, 255, 255,1)",
      "sidebar": "rgba(0, 0, 0,1)",
      "sidebar_border": "rgba(255, 0, 0,0.8)",
      "sidebar_highlight": "rgba(0, 0, 255,1)",
      "sidebar_text": "rgba(255, 255, 255)",
      "tab_background_separator": "rgba(0, 0, 0,0)",
      "tab_background_text": "rgba(255, 255, 255)",
      "tab_line": "rgba(255, 0, 0,1)",
      "tab_loading": "rgba(255, 0, 0,1)",
      "tab_selected": "rgba(0, 0, 0)",
      "tab_text": "rgba(255, 255, 255,1)",
      "toolbar": "rgba(0, 0, 0,1)",
      "toolbar_top_separator": "rgba(255, 0, 0)",
      "toolbar_bottom_separator": "rgba(0, 0, 255,1)",
      "toolbar_field": "rgba(0, 0, 0,0)",
      "toolbar_field_border": "rgba(0, 0, 0,0)",
      "toolbar_field_border_focus": "rgba(0, 0, 0,0)",
      "toolbar_field_focus": "rgba(0, 0, 0,1)",
      "toolbar_field_highlight": "rgba(0, 0, 255,1)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255,1)",
      "toolbar_field_text": "rgba(255, 255, 255,1)",
      "toolbar_field_text_focus": "rgba(255, 255, 255,1)",
      "toolbar_text": "rgba(100, 100, 255,1)",
      "toolbar_vertical_separator": "rgba(0, 0, 0,0)"
    }
  }
}