How to get rid of white screen during ajax request in Mozilla Firefox?

Question

JavaScript

One request on the server is processed for half a second, then returns the page content. All browsers refresh the content of the page after the end of the request, and until that time the old content hangs on the page. But only in Firefox, after the request starts, a white screen is displayed, and after the request ends, new page content is rendered. How to solve this white screen issue in Firefox on the server side?