[polymer-serve] Dynamic imports fail in Firefox / AMD transformed browsers

[btopro]

This is related to #3402 most likely. When using polymer serve to view an asset that dynamically imports via bare import syntax, it fails to resolve correctly.

import("@polymer/paper-button/paper-button.js");

This is most likely due to a timing issue in the babel transform related to doing this as it was the case in the similar issue with build.

[e111077]

Firefox 67 shipped yesterday (May 21, 2019) which provides native support for dynamic imports. Updating browser-capabilities to sidestep this issue for the future.

[btopro]

I'm surprised the bare import resolution didn't solve this but good call, then it'll at least work w/ the latest and greatest polyserve locally (which is probably fine)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.