Examine source code of NegauXLen

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "NegauXLen",
  "manifest_version": 2,
  "description": "I made this for personal use. c:\n\nFor those of you who are wondering, Negau is my original character. I support her with Len.\n\nI drew everything in this persona, just so you all know.\n\nKagamine Len © Vocaloid\nKagayaku Negau © Me"
}