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help/_articles/miscellaneous/blocker-access-rule.md
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article uMatrix and NoScript access rules
miscellaneous
false false
umatrix
firefox
If you use uMatrix or NoScript extensions on Firefox, use the blocker access rule to whitelist Bitwarden servers, so your password manager works effectively on Firefox.

By default, the uMatrix and NoScript extensions may block the Bitwarden Firefox extension from accessing the Bitwarden API servers. Without adding proper rules to whitelist the Bitwarden API servers, logging in and other API operations will fail.

uMatrix

The following uMatrix rule is required:

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

{% callout info %} The UUID included in the above rule (dc8ef5f6-eb0d-4c87-9e9f-0cf803f619e8) will be different for your installation. Use the about:debugging#/runtime/this-firefox page (navigate from Firefox's address bar) to locate your Bitwarden extension UUID. {% endcallout %}

NoScript

Whitelisting the following domain in NoScript is required: bitwarden.com