+A dictionary with the names and locations of PKCS #11 modules to be installed.
+
+**Compatibility:** Firefox 64, Firefox ESR 60.4\
+**CCK2 Equivalent:** `certs.devices`\
+**Preferences Affected:** N/A
+
+#### Windows
+| Type | Registry Location | Registry Value |
+| ---- | ----------------- | -------------- |
+| `Windows:REG_SZ` | `Software\Policies\Mozilla\Firefox\SecurityDevices\NAME_OF_DEVICE` | `PATH_TO_LIBRARY_FOR_DEVICE`
+
+#### macOS
+```
+<dict>
+ <key>SecurityDevices</key>
+ <dict>
+ <key>NAME_OF_DEVICE</key>
+ <string>PATH_TO_LIBRARY_FOR_DEVICE</string>
+ </dict>
+</dict>
+```
+
+#### JSON