Examine source code of DevFox

{
  "manifest_version": 2,
  "name": "DevFox",
  "version": "2.0",
  "theme": {
    "colors": {
      "tab_text": "white",
      "tab_selected": "#5675b9",
      "tab_line": "#5675b9",
      "toolbar": "#393f4c",
      "toolbar_field": "#171b1f",
      "toolbar_field_text": "rgb(249, 249, 250)",
      "toolbar_field_border": "transparent",
      "toolbar_top_separator": "#272b34",
      "toolbar_bottom_separator": "#272b34",
      "popup": "#272b35",
      "popup_text": "#b4b7bb",
      "popup_border": "#272b34",
      "popup_highlight": "#5675b9",
      "popup_highlight_text": "white",
      "sidebar": "#393f4c",
      "sidebar_text": "#b4b7bb",
      "sidebar_border": "#272b34",
      "sidebar_highlight": "#5675b9",
      "sidebar_highlight_text": "white",
      "frame": "#272b35",
      "tab_background_text": "#b6b9bd",
      "bookmark_text": "#ccced2"
    }
  }
}