Examine source code of Textarea Tabbing

{
  "manifest_version": 2,
  "version": "1.1resigned1",
  "name": "Textarea Tabbing",
  "description": "Enter Tab characters in Textareas when pressing the Tab key. \nSelecting text and pressing Tab will indent the selected lines, Shift+Tab will outdent.",
  "author": "Majr",
  "icons": {
    "32": "icon.png",
    "64": "icon-large.png",
    "128": "icon-large@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "textarea-tabbing.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{27d5c3f4-4c65-4335-a32d-f53c298df1c8}"
    }
  }
}