Examine source code of Disposable Mail

{
  "name": "dmail",
  "description": "Disposable Mail Address",
  "homepage_url": "https://github.com/pajecawav/dmail",
  "author": "pajecawav",
  "version": "1.0.0",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "./extension/popup.html"
  },
  "permissions": [
    "*://mail.elif.pw/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b877c35c-d4b5-419a-ab2c-057c4a209b0f}"
    }
  }
}