Hello, 

Any time I open a character sheet, regardless whether I'm viewing or editing it, causes the browser to crash after a couple of seconds. 
This behaviour is persistent with both Chrome (version 128.0.6613.85) as well as with Edge (version  127.0.2651.105)

Does anyone have an idea what might be the cause of this?

Are you running any ad/popup blockers, browser extensions, or a VPN?

disabled all adblockers, even tried from a fresh installation of chrome and brave. no vpn and behaviour stays the same