Examine source code of Futurelab

{
  "name": "Futurelab",
  "manifest_version": 2,
  "version": "6.0",
  "theme": {
    "images": {
      "theme_frame": "test1.png"
    },
    "colors": {
      "frame": "rgba(51, 51, 51, 1)",
      "tab_background_text": "rgba(102, 232, 199, 1)",
      "toolbar": "rgba(160, 162, 163, 1)",
      "bookmark_text": "rgba(102, 232, 199, 1)",
      "toolbar_field": "rgba(96, 113, 122, 1)",
      "toolbar_field_text": "rgba(151, 194, 184, 1)",
      "tab_line": "rgba(128, 151, 153, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9a8ff8dc-fcb4-4aa3-8a5e-def53c8a5843}"
    }
  }
}