Examine source code of Mailvelope

{
  "name": "__MSG_ext_name__",
  "version": "6.2.0",
  "description": "__MSG_ext_description__",
  "homepage_url": "https://mailvelope.com",
  "author": "info@mailvelope.com",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-AQqSMBYb0a8ADg@jetpack",
      "strict_min_version": "131.0"
    }
  },
  "action": {
    "default_icon": {
      "16": "img/Mailvelope/logo_signet_16.png",
      "24": "img/Mailvelope/logo_signet_24.png",
      "32": "img/Mailvelope/logo_signet_32.png",
      "48": "img/Mailvelope/logo_signet_48.png"
    },
    "default_popup": "components/action-menu/actionMenu.html",
    "default_title": "__MSG_ext_name__"
  },
  "icons": {
    "32": "img/Mailvelope/logo_signet_32.png",
    "48": "img/Mailvelope/logo_signet_48.png",
    "64": "img/Mailvelope/logo_signet_64.png",
    "96": "img/Mailvelope/logo_signet_96.png",
    "120": "img/Mailvelope/logo_signet_120.png",
    "128": "img/Mailvelope/logo_signet_128.png",
    "152": "img/Mailvelope/logo_signet_152.png",
    "180": "img/Mailvelope/logo_signet_180.png"
  },
  "background": {
    "scripts": [
      "background.bundle.js",
      "lib/offscreen/offscreen.bundle.js"
    ]
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'; style-src 'unsafe-inline'; img-src data:; connect-src https:;"
  },
  "default_locale": "en",
  "host_permissions": [
    "*://*/*"
  ],
  "oauth2": {
    "client_id": "119074447949-cvf898un7sfnv2ib7r4hvunqd56jm4c4.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.email",
      "https://www.googleapis.com/auth/gmail.readonly",
      "https://www.googleapis.com/auth/gmail.send"
    ]
  },
  "optional_permissions": [
    "nativeMessaging"
  ],
  "options_page": "app/app.html",
  "permissions": [
    "alarms",
    "identity",
    "scripting",
    "storage",
    "tabs",
    "webNavigation"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "client-API/mailvelope-client-api.js",
        "components/decrypt-message/decryptMessage.html",
        "components/generate-key/genKey.html",
        "components/key-backup/backupKey.html",
        "components/restore-backup/backupRestore.html",
        "components/editor/editor.html",
        "components/encrypted-form/encryptedForm.html",
        "res/fonts/*.woff2",
        "img/edit_add-22.png",
        "img/key-24.png",
        "img/key-icon-blue96.png",
        "img/loading.gif",
        "img/mail_locked_96.png",
        "img/mail_signed_96.png",
        "img/mail_open_96.png",
        "img/mail_new.png",
        "img/ok48.png",
        "img/verify-24.png",
        "main.css"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ]
}