Examine source code of Find and Replace Tab Urls

{
  "manifest_version": 2,
  "name": "Find and Replace Tab Url",
  "description": "Find and replace for all active tabs",
  "version": "1.0.1",
  "permissions": [
    "tabs",
    "storage"
  ],
  "author": "Vincent Kahn",
  "browser_action": {
    "default_popup": "frtabs.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon.png",
    "96": "icon@2x.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@findandreplacetaburls"
    }
  }
}