View & delete AO3 script settings (from localStorage) with hints which script they're from. Import & export settings to file for safekeeping or to transfer to another device.
View the data stored by the various userscripts. Often these are configuration options.
You can choose to delete items, export them (to transfer them to another device or just as a backup), or import data from a file.

Go to AO3's homepage.
In the main navigation of AO3, next to “About”, there’s a new menu item “Userscripts”.
From the “Userscripts” menu, select the “Import & Export Script Storage” option. It toggles on.
A table lists all data for AO3 in your browser's storage. The Key is the identifying name for the data, the Content and Length columns tell you a little about what kind of data is stored in this key. The Source (if known to the Import/Export script) links to the script which wrote this data.
To return to the regular homepage content, you can refresh the page or toggle the menu option again.
The script tries to tell you which script originally wrote this data. There are many, many userscripts out there for AO3, and the Import/Export script doesn't know all of them. You'll probably encounter a few unknown sources. If you want me to add scripts and their keys to the list, feel free to DM me here on Greasyfork.