Solved: Parallax behaviour in Firefox vs Chrome

I would like to share my solution about the issue of the different behaviour of the parallax effect in Firefox vs other browsers.

The parallax effect is working if background-attachment is set to fixed. BUT in Firefox the background is behaving like if the background-attachment property is set to scroll.

This behaviour is triggered by the presence of a transform property OR (and this is the case) the "will-change: transform;" property.

So the solution is to add this simple rule to custom.css:

.parallax {
  will-change: auto !important;
}

I saw other tickets opened with this issue, so I'm happy to share this solution, for example this:
Ticket parallax-behaviour-different-between-webbrowsers

This issue is described also in the Firefox mozilla forum:
https://bugzilla.mozilla.org/show_bug.cgi?id=1292499

Hope this helps...
Alexandar Fusè