What is this profilestorage.zpstorage

[lokiys]

The title says it all. It takes 5 MB from all profile files. And inside there is some javascript.

 

[VladZen]

This is localstorage:

Window.localStorage - Web APIs | MDN

The localStorage read-only property of the window interface allows you to access a Storage object for the Document's origin; the stored data is saved across browser sessions.

developer.mozilla.org

chrome.storage | API | Chrome for Developers

developer.chrome.com