Examine source code of Green Express V1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Green Express V1",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgba(236, 212, 162, 0.5)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(17, 49, 13)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(233, 179, 115)",
      "toolbar_field_text": "rgb(103, 34, 26)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(235, 181, 117)",
      "popup_text": "rgb(86, 10, 3)",
      "button_background_active": "rgb(241, 216, 154)",
      "button_background_hover": "rgba(195, 78, 27, 0.59)",
      "frame_inactive": "rgba(243, 212, 176, 0.58)",
      "icons_attention": "rgba(236, 212, 162, 0.5)",
      "ntp_background": "rgba(175, 117, 55, 0.49)",
      "popup_highlight_text": "rgb(31, 5, 2)",
      "popup_highlight": "rgb(241, 141, 99)",
      "sidebar_border": "rgb(149, 83, 36)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e3bd7436-8ee2-4f80-bb96-99896e7c9773}"
    }
  }
}