Examine source code of Firefox - super mario version -

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manifest.json

{
  "theme": {
    "images": {
      "theme_frame": "firefox-supermarioversion-.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Firefox  - super mario version -",
  "manifest_version": 2
}