Examine source code of Basic color

{
  "theme": {
    "images": {
      "theme_frame": "delete.jpg"
    },
    "colors": {
      "frame": "#e3cfcf",
      "tab_background_text": "#211e1e"
    }
  },
  "version": "2.0",
  "name": "Basic color",
  "manifest_version": 2,
  "description": "just basic"
}