Examine source code of Personal Theme 1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "My Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(4, 29, 49)",
      "toolbar_text": "rgb(67, 194, 218)",
      "frame": "rgb(6, 19, 30)",
      "tab_background_text": "rgb(24, 156, 180)",
      "toolbar_field": "rgb(20, 43, 64)",
      "toolbar_field_text": "rgb(255, 196, 0)",
      "tab_line": "rgb(255, 196, 0)",
      "popup": "rgb(4, 29, 49)",
      "popup_text": "rgb(67, 194, 218)",
      "tab_loading": "rgb(255, 196, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa32353e-8d70-4c2f-90b3-0593ec7b4543}"
    }
  }
}