Examine source code of Temp Email

{
  "manifest_version": 2,
  "name": "Temp Mail",
  "description": "Quick Launcher Temp mail Used for Temporary Emails that user can use for short time very easliy and satisfying way without privacy issue",
  "version": "1.0.0",
  "icons": {
    "128": "asset/image/temp128.png"
  },
  "author": "Temp Mail",
  "permissions": [
    "storage",
    "tabs",
    "contextMenus"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Temp Mails",
    "default_icon": "asset/image/temp128.png"
  },
  "background": {
    "scripts": [
      "event.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "content-script.js"
      ],
      "css": [
        "my-styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1f391ede-368e-44cc-9f8c-9f33488de5df}"
    }
  }
}