Examine source code of Chara-Undertale theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#330000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Chara-Undertale theme",
  "manifest_version": 2,
  "description": "Chara (Undertale Character) Theme, Credit to me about the theme, the image have a original owner, i'm not him, enjoy it!"
}