Examine source code of Two Penguins by MaDonna

{
  "name": "Two Penguins by MaDonna",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "PenguinsAboardH1.jpg"
    },
    "colors": {
      "frame": "rgba(156, 179, 250, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(156, 177, 252, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(156, 177, 252, 0.15)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d0c513a1-b3e2-4903-a189-62cb87ef60a6}"
    }
  }
}