palemoon can't display doodle infos

[charlie6]

Hi,
here running Palemoon 29.4.6 64 bits.
Palemoon can't display neither even main page of https://doodle.com/ , nor specific meetings datas. Only a white screen is displayed with the label «Doodle» wrotten on the web page thumbnail.
Earlier version of Palemoon were able to use Doodle though.
Thanks in advance for any help.
Best regards.
Charlie.

[coffeebreak]

The main page does display for me.
But I get a blank page after clicking either "Start free trial": or "Create a doodle".

"Create a doodle" produced both console errors below; "Start free trial" -> invalid regexp group only.

Code: Select all

Error: SyntaxError: invalid regexp group
Source File: https://doodle.com/premium/assets/main/main.bundle.72d907a37510d0261653.js
Line: 51, Column: 150538
Source Code:
h.round(n/255*5),enumerable:!1},hexToRgb:{value:e=>{const t=/(?<colorString>[a-f\d]{6}|[a-f\d]{3})/i.exec(e.toString(16)

Error: SyntaxError: expected expression, got '.'
Source File: https://cdn2.doodle.com/scheduling-experience/organize.206d018efedd5558e978.js
Line: 57, Column: 1024
Source Code:
lementChild.nextElementSibling)),r&&a.appendChild(r),()=>{r?.remove(),a.childElementCount||a.remove()}}var t;return()=>{

The blank page is due to features that Pale Moon does not yet support (new regex parser, optional chaining).

invalid regexp group (forum search)

SyntaxError: expected expression, got '.' (forum search)
optional chaining (forum search)
optional chaining (UXP issues)