Examine source code of Green & Purple gradient

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Green & Purple gradient",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(12, 110, 89)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(47, 58, 97)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(17, 90, 75)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(47, 58, 97)",
      "popup": "rgb(74, 74, 74)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(44, 129, 111)",
      "button_background_hover": "rgb(31, 121, 102)",
      "frame_inactive": "rgb(35, 58, 84)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(36, 36, 36)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(25, 25, 25)",
      "sidebar_border": "rgb(25, 25, 25)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(66, 66, 66)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(59, 59, 59)",
      "tab_loading": "rgb(12, 110, 89)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(67, 142, 126)",
      "toolbar_field_border_focus": "rgb(99, 173, 229)",
      "toolbar_field_border": "rgb(10, 91, 73)",
      "toolbar_field_focus": "rgb(43, 43, 43)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(0, 120, 212)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(44, 54, 90)",
      "toolbar_vertical_separator": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e172304-9465-4410-a246-a6f5af489550}"
    }
  }
}