Examine source code of Space Background

{
  "name": "Space Background",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "10e23599-85bc-4660-ae06-7a67befbbcf9.png"
    },
    "colors": {
      "frame": "rgba(179, 179, 179, 1)",
      "tab_background_text": "rgba(212, 212, 212, 1)",
      "toolbar": "rgba(255, 255, 255, 0.12)",
      "bookmark_text": "rgba(255, 255, 255, 0.48)",
      "toolbar_field": "rgba(255, 255, 255, 0.18)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.5)",
      "tab_line": "rgba(3, 3, 3, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6c2e5fbf-89ec-4b5d-b2e8-f93d54608963}"
    }
  }
}