Examine source code of Rainbow Heart Macarons

{
  "name": "Rainbow Heart Macarons",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Rainbow Heart Macarons.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(247, 137, 27, 1)",
      "toolbar": "rgba(255, 255, 255, 0.61)",
      "bookmark_text": "rgba(137, 189, 64, 1)",
      "toolbar_field": "rgba(142, 235, 245, 0.64)",
      "toolbar_field_text": "rgba(255, 117, 162, 1)",
      "tab_line": "rgba(25, 209, 133, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ea3ee458-26c3-4188-b9d6-15e2418e1450}"
    }
  }
}