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# XPCOMUtils module
XPCOMUtils is a utility class that lives in
{searchfox}`resource://gre/modules/XPCOMUtils.sys.mjs <js/xpconnect/loader/XPCOMUtils.sys.mjs>`.
Its name is a little confusing because it does not live in XPCOM itself,
but it provides utilities that help JS consumers to make consuming
`sys.mjs` modules and XPCOM services/interfaces more ergonomic.
```{js:autoclass} XPCOMUtils
:members:
```