Examine source code of Homepage

{
  "name": "Homepage Theme",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Homepage.png"
    },
    "colors": {
      "frame": "rgba(210, 247, 238, 1)",
      "tab_background_text": "rgba(186, 137, 39, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b1d5f6dd-0631-4370-bb5b-b40cbb604f5f}"
    }
  }
}