Examine source code of Clean Green

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Clean Green",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(34, 34, 34)",
      "toolbar_text": "rgb(226, 255, 226)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(49, 208, 49)",
      "toolbar_field": "rgb(25, 25, 25)",
      "toolbar_field_text": "rgb(49, 208, 49)",
      "tab_line": "rgb(49, 208, 49)",
      "popup": "rgb(34, 34, 34)",
      "popup_text": "rgb(226, 255, 226)",
      "button_background_active": "rgba(49, 208, 49, 0.5)",
      "button_background_hover": "rgba(103, 214, 103, 0.19)",
      "frame_inactive": "rgba(86, 85, 81, 0.57)",
      "icons_attention": "rgb(0, 186, 0)",
      "icons": "rgb(49, 208, 49)",
      "popup_border": "rgb(0, 0, 0)",
      "popup_highlight": "rgba(49, 208, 49, 0.32)",
      "tab_selected": "rgb(48, 48, 48)",
      "tab_text": "rgb(226, 255, 226)",
      "tab_loading": "rgb(49, 208, 49)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74f13e72-2eec-46a1-bf36-a4ce35f7181a}"
    }
  }
}