Examine source code of Selection Disabler

{
  "manifest_version": 2,
  "name": "Selection Disabler",
  "description": "Disable Selection on websites",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/48.png"
  },
  "content_scripts": [
    {
      "js": [
        "content_script.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "version": "1.0.0.1resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{090589d3-7a44-46bc-bca1-19e11cc12883}"
    }
  }
}