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help/_articles/miscellaneous/umatrix-access-rule.md

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layout title categories featured popular tags
article uMatrix access rules
miscellaneous
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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 the bitwarden API servers, logging in will fail.

The following uMatrix rules 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. Use the about:debugging#addons page to find your UUID. {% endnote %}