Examine source code of BigCreek

{
  "name": "BigCreek",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "BigCreek.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(31, 22, 3, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d7ac514-eadc-4a46-b38c-7461e16ac801}"
    }
  }
}