Thanks Yoshi for working on this
Note that we do have a DevTools bug 
(https://bugzilla.mozilla.org/show_bug.cgi?id=1898549), to check that 
scripts using deferred imports can still be used properly in the Debugger
On Tuesday, November 18, 2025 at 11:01:14 AM UTC+1 Yoshi Huang wrote:

> *Summary:*
> `import defer` allows lazily evaluating ES modules, to reduce the 
> performance impact of modules that are not actually needed from the startup.
>
> *Bug*: https://bugzilla.mozilla.org/show_bug.cgi?id=1898544
>
> *Specification: *https://tc39.es/proposal-defer-import-eval/
>
> *Standards Body*: ECMA
>
> *Platform coverage*: ALL
>
> *Preference*: javascript.options.experimental.defer_import_eval
>
> *DevTools bug*: n/a
>
> *Link to standards-positions discussion*: n/a
>
> *Other browsers*:
> Chrome: https://issues.chromium.org/issues/398218423
> Webkit: https://bugs.webkit.org/show_bug.cgi?id=282882
>
> *web-platform-tests*: n/a, it is tested by test262
> test262/language/import/import-defer
>
>

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