Examine source code of Privasemail

{
  "name": "PrivaseMail",
  "short_name": "PrivaseMail",
  "description": "Easily create a different email for each website to hide your real email. Protect your inbox against spams, phishing, data breaches",
  "version": "2.6",
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png",
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "https://*.PrivaseMail.com/*",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_title": "PrivaseMail-extension",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@Privasemail.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "generate-random-alias": {
      "suggested_key": {
        "default": "Ctrl+Shift+X"
      },
      "description": "Generate a random email alias"
    },
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+S"
      },
      "description": "Open the extension action menu"
    }
  }
}