Examine source code of Ice Angel

{
  "name": "Ice Angel",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "IceAngel3.jpg"
    },
    "colors": {
      "frame": "rgba(135, 143, 156, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(136, 144, 158, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(136, 144, 158, 0.08)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{23440773-14bf-4760-bbbe-a53ded2f5bfb}"
    }
  }
}