---
layout: article
title: uMatrix access rules
categories: [miscellaneous]
featured: false
popular: false
tags: [umatrix, firefox]
---

By default, the uMatrix addon will block the bitwarden Firefox addon from accessing the bitwarden API servers. Without adding proper rules to allow bitwarden API servers, logging in will fail.

The following [uMatrix rules](https://github.com/gorhill/uMatrix/wiki/Rules-syntax) are required:

```
dc8ef5f6-eb0d-4c87-9e9f-0cf803f619e8.moz-extension-scheme bitwarden.com xhr allow
dc8ef5f6-eb0d-4c87-9e9f-0cf803f619e8.moz-extension-scheme bitwarden.com cookie allow
```

{% note %}
The UUID included in the above rule will be different for your installation.
{% endnote %}