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.
The following uMatrix rule is required:
dc8ef5f6-eb0d-4c87-9e9f-0cf803f619e8.moz-extension-scheme bitwarden.com xhr allow
The UUID included in the above rule (
dc8ef5f6-eb0d-4c87-9e9f-0cf803f619e8) will be different for your installation.
about:debugging#/runtime/this-firefox page (navigate from Firefox’s address bar) to locate your Bitwarden extension UUID.
Whitelisting the following domain in NoScript is required:
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