Examine source code of Amber-OLED

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Amber-OLED",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(210, 217, 251)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 115, 9)",
      "tab_line": "rgb(103, 0, 255)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(103, 0, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d948c178-a576-4321-bfc1-d4aa172d2a95}"
    }
  }
}