Examine source code of Schachenmann

{
  "name": "Schachenmann",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Schachenmann_schwarz_gelb.jpg"
    },
    "colors": {
      "frame": "rgba(157, 159, 163, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{08ac1947-645c-45a1-901b-b312bf73add6}"
    }
  }
}