TOR_PROVIDER=none throws an error at launch

When running with TOR_PROVIDER=none I get the following console error

TorProviderInitError: Failed to load resource://gre/modules/TorLauncherUtil.sys.mjs TorProviderBuilder.sys.mjs:51:5

This also happens in 16.0a6. The error comes from TorProviderNone.sys.mjs, which is still using the resource: path after #43824 (closed) switched to moz-src:.

/cc @pierov