Examine source code of Orange simple theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Orange & simple",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(255, 131, 0)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(255, 131, 0)",
      "tab_background_text": "rgb(255, 193, 0)",
      "toolbar_field": "rgb(255, 193, 0)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(14, 255, 61)",
      "popup": "rgb(255, 131, 0)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(14, 255, 61)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6035a8c7-9fbf-4652-9ee4-aea9fe56a1f9}"
    }
  }
}