Just recovered from a bad hang of my Windows 10 laptop.
A not yet known bug in Edge browser on windows 10, (and probably IE too), can make the system instable.
Never delete a large range using IDBOBjectStore.delete(IDBKeyRange). Edge/IE users on windows 10, running that code will experience a deadlocked operating system afterwards. Database is first filled with small objects from id 1...100000 (takes a few seconds) before doing this delete operation. It's that simple to reproduce.
IDBObjectStore.delete(IDBKeyRange.bound(100, 99000))