BTT completely freezes any browser, when using it to save a file to a new folder created through the interface of this browser.
Procedure (Safari / Opera / Chrome - different versions): if you save any file from the Internet to an already existing folder or create a folder through Finder - everything is fine. If you save a file in the browser "save file as" interface and create any folder anywhere in the system - browser freezes completely. When you disable BT for the browser - everything works normally.
Macbook pro 15 inch '16, OSx Mojave, Catalina 10.15.1, BTT 3.207, GoldenChaos-BTT 2.600