Why so serious Firefox

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manifest.json
{
  "theme": {
    "images": {
      "theme_frame": "jokerheader.png"
    },
    "colors": {
      "frame": "#5e5e5e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Why so serious",
  "manifest_version": 2,
  "description": "Why so serious little 1 hehehehehe!"
}

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