Examine source code of Alternative Future

{
  "name": "Alternative Future",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Firefox addons.jpg"
    },
    "colors": {
      "frame": "rgba(252, 252, 252, 1)",
      "tab_background_text": "rgba(240, 34, 96, 0.55)",
      "toolbar": "rgba(255, 255, 255, 0.19)",
      "bookmark_text": "rgba(255, 0, 0, 0.43)",
      "toolbar_field": "rgba(196, 49, 49, 0.13)",
      "toolbar_field_text": "rgba(209, 54, 54, 0.51)",
      "tab_line": "rgba(133, 0, 0, 0.48)"
    }
  }
}