local/offline hosted region maps no longer working on firefox

[mmguero]

These maps:

Region Maps
Source - Originator Bytes | Destination - Responder Bytes
Source - Sum of Total Bytes | Destination - Sum of Total Bytes
Source - Top Connection Duration | Destination - Top Connection Duration

listed on the lower half of the maps dialog on the connections dashboard are no longer working on Mozilla firefox. They return:

Error downloading vector data
Cannot download World (offline) file. Please ensure the CORS configuration of the server permits requests from the Kibana application on this host.

However, on Chromium it works fine. It's not an issue with the server. In the kibana docker container output we see (for Chromium, at least):

kibana_1         | 2019-11-20 17:55:24,474 INFO spawned: 'maps' with pid 4265
kibana_1         | 2019-11-20 17:55:24,475 INFO success: maps entered RUNNING state, process has stayed up for > than 0 seconds (startsecs)
kibana_1         | Starting up http-server, serving /opt/maps
kibana_1         | Available on:
kibana_1         |   http://127.0.0.1:28991
kibana_1         |   http://192.168.32.10:28991
kibana_1         | Hit CTRL-C to stop the server
...
kibana_1         | [Wed Nov 20 2019 17:55:35 GMT+0000 (UTC)] "OPTIONS /world.geojson" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36"

For Firefox we don't see the request at all. Some kind of browser protection is going on.

[mmguero]

Firefox's web console says:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:28991/world.geojson. (Reason: CORS request did not succeed).

[mmguero]

FWIW the command running on the "server" is

node /usr/bin/http-server /opt/maps --cors=* -p 28991

[mmguero]

See this article: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSDidNotSucceed

Most likely:

As of Firefox 68, https pages are not permitted to access http://localhost, although this may be changed by Bug 1488740.

[mmguero]

This is working again for me 🤷