Examine source code of Yojohan Shinwa Taikei

{
  "theme": {
    "images": {
      "theme_frame": "yojohan3.png"
    },
    "colors": {
      "frame": "#fed840",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Yojohan Shinwa Taikei",
  "manifest_version": 2,
  "description": "Yojohan Shinwa Taikei. Image: Pixiv."
}