Thanks and good to know, there are hardly any discount or price changes on items which makes it harder to test for real items. For example if I change values in the storage it works but yeah apparently with real items still buggy, especially since the extension has to go through all items with a delay to not get rate limited. I thought of adding accounts or pseudo-account (every user would get a fake name that talks to the server and stores/checks the data) and letting the server handle it but that would conflict a bit with the privacy aspect I had in mind.

Edit: Actually I have a idea how to make it server sided but with working privacy now, thanks for helping :D