It doesn't discriminate Mozilla based browsers. It checks if the User-Agent string contains "Mozilla".

Due to historical reasons, every browser (and software pretending to be a browser) has "Mozilla" in it's User-Agent string.

This is a User-Agent string for Google Chrome on Windows 10:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36