Examine source code of DownPersona

{
  "theme": {
    "images": {
      "theme_frame": "down2.png"
    },
    "colors": {
      "frame": "#5e5d5d",
      "tab_background_text": "#8f8f8f"
    }
  },
  "version": "2.0",
  "name": "DownPersona",
  "manifest_version": 2,
  "description": "Made by designer DownloadArexith. Minimalistic, dark, and colorful."
}