Examine source code of Atmos

{
  "name": "Atmos",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "cubies-2.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(102, 102, 102, 0.13)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(165, 189, 100, 0.42)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 0.28)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0b2d753a-d657-401a-b490-4efd457134d2}"
    }
  }
}