Examine source code of Email Revealer

{
  "manifest_version": 2,
  "name": "Email Revealer",
  "version": "0.2.0",
  "description": "Show email addresses instead of names in Gmail and Inbox. Automatically detects and transforms sender/recipient names to their corresponding email addresses for better clarity.",
  "permissions": [
    "storage",
    "https://mail.google.com/*",
    "https://inbox.google.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://inbox.google.com/*"
      ],
      "js": [
        "content-firefox.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_title": "Email Revealer",
    "default_popup": "popup-firefox.html"
  },
  "background": {
    "scripts": [
      "background-firefox.js"
    ]
  },
  "web_accessible_resources": [
    "content-firefox.js"
  ],
  "author": "Your Name",
  "homepage_url": "https://github.com/yourusername/gmail-names-to-email",
  "browser_specific_settings": {
    "gecko": {
      "id": "{54c3c30e-7c2c-4909-8fda-41691f9b3960}"
    }
  }
}