Examine source code of matrix_red

{
  "theme": {
    "images": {
      "theme_frame": "CopyofBlood_Matrix_by_mdpshow.jpg"
    },
    "colors": {
      "frame": "#1a45ba",
      "tab_background_text": "#9dd100"
    }
  },
  "version": "2.0",
  "name": "matrix_red",
  "manifest_version": 2
}