Examine source code of Pastel Blue Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Pastel Blue Theme for Firefox",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(115, 185, 211)",
      "toolbar_text": "rgb(23, 23, 23)",
      "frame": "rgb(163, 220, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(23, 23, 23)",
      "tab_line": "rgb(154, 212, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(23, 23, 23)",
      "tab_loading": "rgb(154, 212, 255)"
    }
  }
}