Library is not responding to 401 authentication challenge when bundled and run in Firefox
When bundled in a web app (e.g. [xmr-sample-app](https://github.com/woodser/xmr-sample-app)) and run in Firefox, monero-javascript's http client (used in [MoneroRpcConnection.js](https://github.com/monero-ecosystem/monero-javascript/blob/master/src/main/js/rpc/MoneroRpcConnection.js)) does not respond to the server's 401 authentication challenge.