Examine source code of FireFox Grey

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manifest.json

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxGW.jpg"
    },
    "colors": {
      "frame": "#c9c9c9",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "FireFox Grey",
  "manifest_version": 2
}