Examine source code of stay gray

{
  "name": "stay gray",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "abstrakt130.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(61, 61, 61, 0.44)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(61, 61, 61, 0.66)",
      "toolbar_field_text": "rgba(252, 252, 252, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a6f879f-d9da-4682-9b7d-65339489e4a4}"
    }
  }
}