Examine source code of syntax highlighting

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  "version": "1.0.0",
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    "activeTab",
    "tabs",
    "contextMenus"
  ],
  "browser_action": {
    "default_title": "PrettyPrint JSON"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{32ccbbf3-8305-4cde-a73e-445bc3bd0332}"
    }
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}