Examine source code of Email Blur Protector

{
  "manifest_version": 2,
  "name": "Email Blur Protector",
  "version": "1.0",
  "description": "Automatically blur email addresses on web pages. Reveal on click.",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{05fcb372-e7e3-4800-b7f1-5838b1a35082}"
    }
  }
}