Added menu to export to .txt and import your backup
[Unofficial] Added functionality for @Min_ 's https://greasyfork.org/en/scripts/5835-ao3-kudosed-and-seen-history
1. Adds a data management menu at the top for Exporting/Importing your history data.
If you want more changes check C89sd's unofficial patch:
https://greasyfork.org/pt-BR/scripts/528933-extend-ao3-kudosed-and-seen-history-export-import-standalone-light-dark-mode-toggle
