Why does the font appear bolder on mac?

Question

css

Downloaded FiraSans font via google fonts. On a Mac, it appears bolder than it is. Connected in two different ways - nothing changes.
What could be the problem? And how to fix it with css? Correcting poppy and browser settings is not an option, tested on different poppies
How it turns out on the page

How there should be

1 connection option

<link href="https://fonts.googleapis.com/css?family=Fira+Sans:300,400,500,600,700&amp;subset=cyrillic,cyrillic-ext" rel="stylesheet">

2 connection option

@font-face {
  font-family: "Fira sans";
  src: url("../fonts/FiraSans/FiraSans-SemiBold.woff2") format("woff2"),
       url("../fonts/FiraSans/FiraSans-SemiBold.woff") format("woff"),
       url("../fonts/FiraSans/FiraSans-SemiBold.ttf") format("truetype");
  font-weight: 600;
  font-display: swap;
}

Font styles

font-size: 13px;
    font-weight: 600;
    font-style: normal;
    font-stretch: normal;
    letter-spacing: 1px;

Answer 1

Here is a description of the problem and how to solve it. Maybe it will help

Answer 2

Windows and Axis have a different approach to font smoothing. So maybe not "on a poppy it's thicker than it is", but "on Windows it's thinner than it is";)