Navigate to a point before the issue arises.
Open the Fire Fox Developer Tools by pressing F12.
Within the Developer Tools click on the Network tab. If you do not see the Network tab you might need to expand the view by clicking the >> icon.
Check the Persist Logs checkbox (this allows the tool to record data as you move between tabs.)
Try to recreate the issue or error that you have reported to us. For example, take the steps you followed when first encountering the issue. As you do, you will see the Developer Tools automatically fill with data.
Once you have fully replicated the issue, right click on any of the rows in the bottom part of the log and click on Save All As HAR.
Save the file to a location on your computer.
Locate the file and attach it the email replying to our request.
Once you have the file, we recommend that you zip and password protect it. Please provide us with the password in a separate reply.