Windows 10 & 11 : Microsoft Edge, Mozilla Firefox, or Google Chrome
Egnyte ended support for Windows 7, 8, and 8.1 on January 14th, 2020.
Mac OS X (10.15 and later): Apple Safari 10+ or Chrome
Linux: Office Online works in both Firefox or Chrome on Linux, but some features may not be available.
For more details, see Egnyte-Policy-for-Browser-and-OS-Support