Examine source code of Dark theme by fr0zert

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark night",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(219, 219, 219)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(226, 226, 226)",
      "toolbar_field": "rgb(22, 22, 22)",
      "toolbar_field_text": "rgb(237, 237, 237)",
      "tab_line": "rgb(74, 74, 74)",
      "popup": "rgb(59, 59, 59)",
      "popup_text": "rgb(214, 214, 214)",
      "tab_loading": "rgb(74, 74, 74)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d5473dbd-b72e-45b3-975b-c4b716afa59a}"
    }
  }
}