Examine source code of Folia

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "gran_01",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(57, 169, 81)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(32, 86, 44)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(32, 86, 44)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(57, 169, 81)",
      "popup": "rgb(23, 49, 29)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(57, 169, 81)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7732fd78-9a58-42c8-81f6-cafdaf5724c4}"
    }
  }
}