I'm getting the same error (Firefox 101.0 64-bit on a Windows PC).
Console messages:
exception thrown: RuntimeError: indirect call to null,@:wasm-function[7152]:0x1e9f15 @:wasm-function[2566]:0xa3884 @:wasm-function[11003]:0x33cbd2 @:wasm-function[21633]:0x6dc486 @:wasm-function[13153]:0x3d46d5 @:wasm-function[1444]:0x5f16a @:wasm-function[6652]:0x1b85b4 @:wasm-function[1250]:0x48122 @:wasm-function[1627]:0x6aee7 @:wasm-function[35973]:0xa94008 @:wasm-function[950]:0x364fa @:wasm-function[18670]:0x56aa91 @:wasm-function[5271]:0x15aaa1 @:wasm-function[18658]:0x569cf4 @:wasm-function[831]:0x2be16 @:wasm-function[36928]:0xab66b5 @:wasm-function[7123]:0x1e936a @:wasm-function[7152]:0x1e9de3 @:wasm-function[2566]:0xa389a @:wasm-function[11003]:0x33cbd2 @:wasm-function[21633]:0x6dc486 @:wasm-function[13153]:0x3d46d5 @:wasm-function[1444]:0x5f16a @:wasm-function[950]:0x364fa @:wasm-function[18670]:0x56aa91 @:wasm-function[18670]:0x56aa47 @:wasm-function[5271]:0x15aaa1 @:wasm-function[36889]:0xab56c9 @:wasm-function[15117]:0x4b1701 @:wasm-function[22484]:0x6ee5e4 Godot/Module._main@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:9:326100">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:9:326100</a> callMain@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:9:331025">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:9:331025</a> SafeEngine/start/Engine<!--</<@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:696:17" class="redactor-linkify-object"--><a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:696:17">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:696:17</a> SafeEngine/start/Engine<!--<@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:691:14" class="redactor-linkify-object"--><a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:691:14">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:691:14</a>" class="redactor-linkify-object"><a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:691:14">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:691:14</a> promise callback*SafeEngine/start/Engine<@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:690:31">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:690:31</a> promise callback*start@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:669:22">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:669:22</a> SafeEngine/startGame/Engine<@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:729:22">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:729:22</a> promise callback*startGame@<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:728:8">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:728:8</a> @<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:225:12">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:225:12</a> @<a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:245:5">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:245:5</a> index.js:362:18 onPrintError <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:362 callMain">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:362 callMain</a> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:9 Engine">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:9 Engine</a> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:696 Engine">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:696 Engine</a> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:691 (Async:">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:691 (Async:</a> promise callback) Engine <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:690 (Async:">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:690 (Async:</a> promise callback) start <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:669 Engine">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:669 Engine</a> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:729 (Async:">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:729 (Async:</a> promise callback) startGame <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:728 ">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.js:728 </a><anonymous> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:225">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:225</a> <anonymous> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:245">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:245</a>
and
indirect call to null index.html:215:13 displayFailureNotice <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:215 (Async:">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:215 (Async:</a> promise callback) <anonymous> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:240 <anonymous>">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:240 <anonymous></a> <a href="https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:245">https://v6p9d9t4.ssl.hwcdn.net/html/5903027/index.html:245</a>