XPages Warning : Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience

We get the following warning in our Xpages Application in all browsers :

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience

The warning is caused by : xhr.open("GET", _3f(url), false); in dojo.js

The parameter if changed to true from false would fix it i presume as that flag is for asynchronous request.

My question is "Can this be changed without other side effects". If yes , which file do we change it in.

Or is there any other xpages property that would fix this warning

Also there are a host of warnings specific to firefox generated from firefox specific css that gets applied.

Does any one one have any idea how to fix this?

This issue is being investigated by HCL .

You may follow the progress on https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0109436

For Information to thos who may be interested.