Examine source code of Simple Yet Effective

{
  "theme": {
    "images": {
      "theme_frame": "ff1.png"
    },
    "colors": {
      "frame": "#e8e8e8",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Simple Yet Effective",
  "manifest_version": 2,
  "description": "designed for width of 1440px"
}