It is related to indexDB and DOM storage.
If I recall correctly, when you go to html5test.com, it will test and create the storage folders and websappstore.sqlite and other files.
I have it disabled and/or read only and I only enable it when needed, but, still, read only.
Additional data from Mozilla:
https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
Edited 1 time(s). Last edit at 06/21/2016 12:51AM by JohnHell.