Firefox dev server manifest warnings

{
  "content_security_policy": {
    "extension_pages": "script-src 'self' http://localhost;object-src 'self';"
  },
  "key": "..."
}

{
  "content_security_policy": {
    "extension_pages": "script-src 'self' http://localhost;object-src 'self';"
  },
  "key": "..."
}