Examine source code of Jelly-Bear

{
  "name": "jelly (600 × 200 px)",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Jelly (600 × 200 px) .png"
    },
    "colors": {
      "frame": "rgba(194, 246, 255, 1)",
      "tab_background_text": "rgba(250, 182, 243, 1)",
      "toolbar": "rgba(191, 240, 255, 1)",
      "bookmark_text": "rgba(255, 150, 239, 1)",
      "toolbar_field": "rgba(252, 184, 243, 0)",
      "toolbar_field_text": "rgba(250, 182, 243, 1)",
      "tab_line": "rgba(249, 209, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24e0e7f1-e16d-4af3-847b-b210f6db925e}"
    }
  }
}