Examine source code of Know Your Master

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  "theme": {
    "images": {
      "theme_frame": "head.JPG"
    },
    "colors": {
      "frame": "#cfcfcf",
      "tab_background_text": "#ededed"
    }
  },
  "version": "2.0",
  "name": "Know Your Master",
  "manifest_version": 2,
  "description": "This is my work. feel free to use it if you want."
}