- Go to the Humble Bundle website
- Make sure you are logged in
- Press
F12to open the Web Developer Tools - Go to the Storage tab in the Web Deloper Tools
- On the left pane, Select Cookies and then https://www.humblebundle.com
- On the right pane, click on the row that has _simpleauth_sess as its first column
- Double-click on the Value column and copy the selected value
For a visual guide on steps 4 to 7, see this picture.