(mozilla-projects-nss-pkcs11-module-installation)=

# PKCS11 module installation

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[PKCS #11](/en-US/PKCS11) modules are external modules which add to Firefox support for
smartcard readers, biometric security devices, and external certificate stores. This article
covers the two methods for installing PKCS #11 modules into Firefox. Users can use the
preferences dialog to install or remove PKCS #11 module. Extensions can programmatically manage
PKCS #11 modules using the nsIPKCS11 programming interface.

:::{note}
**Note:** The information in this article is specific to Firefox 3.5 and newer. Older versions
of Firefox may support the
[window.pkcs11](https://developer.mozilla.org/en-US/docs/Web/API/Window/pkcs11) property
for installing PKCS #11 modules.
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(using-the-firefox-preferences-to-install-pkcs-11-modules)=

## [Using the Firefox preferences to install PKCS #11 modules](#using_the_firefox_preferences_to_install_pkcs_11_modules)

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1. Save the PKCS #11 module to a permanent location on your local computer
2. Open the Firefox preferences dialog. Choose "Advanced" > "Encryption" > "Security Devices"
3. Choose "Load"
4. Enter a name for the security module, such as "My Client Database". NOTE: there is currently a
   bug in Firefox where international characters may cause problems.
5. Choose "Browse..." to find the location of the PKCS #11 module on your local computer, and
   choose "OK" when done.
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(provisioning-pkcs-11-modules-using-the-pkcs11-api)=

## [Provisioning PKCS #11 modules using the pkcs11 API](#provisioning_pkcs_11_modules_using_the_pkcs11_api)

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Starting with Firefox 58, extensions can use the `pkcs11` browser extension API to enumerate
PKCS #11 modules and make them accessible to the browser as sources of keys and certificates.
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## [See also](#see_also)

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- [Web security](https://developer.mozilla.org/en-US/docs/Web/Security)
- {ref}`mozilla_projects_nss_pkcs11`
- `pkcs11.installModule()`
- `pkcs11.isModuleInstalled()`
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