Drag and drop the History.db file onto the gray box. This file is not sent to the network, it is only read within this page in your browser. To access the History.db file: within Finder, use Command+Shift+g to activate GoTo Folder and type or paste
~/Library/Safari, then click Go. You should see the file and, with some strategic resizing of the Finder window, be able to drop it here:
v0.1 June 15, 2019 Copyright © 2019 Jefferson Scher (BSD-3-Clause License). sql.js © kripken and lovasoa (MIT License). FileSaver.js © 2016 Eli Grey (MIT License). MDN code samples © Mozilla Contributors or Public Domain (License). No claim to your data!