WebIDE locks up while loading require("neopixel") on Nordic nRF52840 Dongle

Note the same for the online WebIDE

https://www.espruino.com/ide/

Web IDE version 0.75.10

>>> Receiving...
Got "< << {\"VERSION\":\"2v06.6\",\"GIT_COMMIT\":\"db576d70\",\"BOARD\":\"NRF52840DONGLE\",\"FLASH\":1048576,\"STORAGE\":40960,\"RAM\":262144,\"SERIAL\":\"2325de65-c6b872ca\",\"CONSOLE\":\"USB\",\"MODULES\":\"Flash,Storage,heatshrink,net,dgram,http,NetworkJS,neopixel\",\"EXPTR\":536885592} >> >\r\n>"
>>> 
[notify_info] Found NRF52840DONGLE, 2v06.6
Loading https://www.espruino.com/json/NRF52840DONGLE.json
ERROR: getURL("https://www.espruino.com/json/NRF52840DONGLE.json") error : HTTP 404
Board JSON loaded
Firmware >1.43 supports faster writes over USB
Set Slow Write = false
Device found {"portName":"webserial:1091:498b"}
[success] Connected to Web Serial, webserial:1091:498b
>>> Connected to Web Serial, webserial:1091:498b
>>> Minifying
>>> Minification complete
Found a prompt... great!
Splitting for reset(), delay 250


Connection Failed.

Disconnect callback... {"port":"Web Serial","portName":"webserial:1091:498b"}
WARNING: [notify_warn] Disconnected from Web Serial, webserial:1091:498b
>>> Disconnected from Web Serial, webserial:1091:498b
>>> Connecting...
Set Slow Write = true
Serial> Pre-paired Web Serial device already found
>>> Connecting to serial port
Serial> ERROR: InvalidStateError: Failed to execute 'open' on 'SerialPort': The port is already open.
ERROR: [notify_error] Connection Failed.
>>> Connection Failed.

At this point, powering down is the only option.

Trying to block copy into L-Hand console side, only first char 'r' shows and console then locks

require("neopixel").write(D2, [11,11,0]);

 2v06.6 (c) 2019 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
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>
>r