Examine source code of Light grey solid theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Light grey solid theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(210, 210, 210)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(77, 77, 77)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(237, 237, 237)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(77, 77, 77)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca869f75-0e29-40c9-b57d-3b03351854d2}"
    }
  }
}