Examine source code of First Grelek

{
  "theme": {
    "images": {
      "theme_frame": "mozilla_header.PNG"
    },
    "colors": {
      "frame": "#0efa0a",
      "tab_background_text": "#0072f5"
    }
  },
  "version": "2.0",
  "name": "First Grelek",
  "manifest_version": 2
}