Examine source code of Eevee Evolution

{
  "name": "Eevee Evolution",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "5ab6df4b4b66437d8c1e723af0aaed4f.jpg"
    },
    "colors": {
      "frame": "rgba(230, 14, 28, 1)",
      "tab_background_text": "rgba(10, 10, 10, 0.6)",
      "toolbar": "rgba(26, 51, 240, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(235, 228, 18, 1)",
      "toolbar_field_text": "rgba(5, 5, 5, 1)"
    }
  }
}