Examine source code of Gamma Doppler

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#2b2b2b",
      "tab_background_text": "#8ffffb"
    }
  },
  "version": "2.0",
  "name": "Gamma Doppler",
  "manifest_version": 2,
  "description": "Theme inspired by Counter-Strike's Gamma Doppler skins."
}