Noticed while trying to figure out another bug

Open about:support, clear the start-up cache and restart. After the restart, the console will report 3 errors of the same type

[Exception... "Component returned failure code: 0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH) [nsIXPCComponents_Utils.readUTF8URI]"  nsresult: "0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH)"  location: "JS frame :: resource://gre/modules/L10nRegistry.jsm :: L10nRegistry.loadSync :: line 684"  data: no] L10nRegistry.jsm:684:19
    loadSync resource://gre/modules/L10nRegistry.jsm:684
    fetchFile resource://gre/modules/L10nRegistry.jsm:599
    generateResourceSetSync resource://gre/modules/L10nRegistry.jsm:504
    map self-hosted:221
    generateResourceSetSync resource://gre/modules/L10nRegistry.jsm:499
    generateResourceSetsForLocaleSync resource://gre/modules/L10nRegistry.jsm:441
    next self-hosted:1416
    generateResourceSetsForLocaleSync resource://gre/modules/L10nRegistry.jsm:450
    next self-hosted:1416
    generateResourceSetsForLocaleSync resource://gre/modules/L10nRegistry.jsm:450
    next self-hosted:1416
    generateResourceSetsForLocaleSync resource://gre/modules/L10nRegistry.jsm:450
    InterpretGeneratorResume self-hosted:1468
    next self-hosted:1416
    generateResourceSetsForLocaleSync resource://gre/modules/L10nRegistry.jsm:450
    InterpretGeneratorResume self-hosted:1468
    next self-hosted:1416
    generateBundlesSync resource://gre/modules/L10nRegistry.jsm:178
    InterpretGeneratorResume self-hosted:1468
    next self-hosted:1416
    next resource://gre/modules/Localization.jsm:147
    formatWithFallbackSync resource://gre/modules/Localization.jsm:287
    formatMessagesSync resource://gre/modules/Localization.jsm:354

Restart normally and there won't be any errors. I guess the lack of cache is not correctly managed, then it creates it and everything works as normal?

The severity field is not set for this bug.
:m_kato, could you have a look please?

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L10nRegistry.jsm has been removed in bug 1660392.