Steps to import your browser's history.

Step 1.

First, you have to export your browser's history file. This needs to be in JSON file format. Google Chrome has a extension to do this; you can learn about it here: https://recoverit.wondershare.com/computer-backup/backup-chrome-history-bookmarks.html

Step 2.

Upload the JSON file here.

Step 3. 

Click to view the file and then click 'Import history file'. For Chrome, the file will be named: 'chrome_history.json'.

This will import all your browser's history and convert YouTube.com videos for you.