Examine source code of Night Theme 1.0

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "05080D",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgba(24, 40, 97, 0.25)",
      "toolbar_text": "rgb(188, 215, 215)",
      "frame": "rgb(5, 8, 13)",
      "tab_background_text": "rgb(169, 193, 193)",
      "toolbar_field": "rgb(5, 8, 13)",
      "toolbar_field_text": "rgb(159, 118, 149)",
      "tab_line": "rgba(134, 126, 136, 0)",
      "popup": "rgba(78, 83, 102, 0.36)",
      "popup_text": "rgb(173, 208, 212)",
      "tab_loading": "rgba(134, 126, 136, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a2eeb04-0e56-4989-bfbd-f634dbe5b8fe}"
    }
  }
}