How to generate a HAR file

Note: 

HAR files contain sensitive data!

• content of the pages you downloaded while recording
• your cookies, which will allow anyone with the HAR file to impersonate your account
• all the information that you submitted while recording: personal details, passwords, credit card numbers...

How to generate the HAR file with Chrome

1. Open Google Chrome and go to the page where the issue is occurring.
2. Open the Developer Tools from the menu (Menu > Tools > developer tools)
3. Click on the Network tab
   
4. Look for a round Record button  in the upper left corner of the Network tab, and make sure it is red. If it is grey, click it once to start recording.
5. Check the box next to Preserve log.
6. Click the Clear button  to clear out any existing logs from the Network tab.
7. Now try to reproduce the issue that you were experiencing before, while the network requests are being recorded.
8. Save the capture by right-clicking on the grid and choosing "Save as HAR with Content"

How to generate the HAR file with Firefox 41

• Start Firefox Developer Tools in Network mode (Top right menu > Developer > Network, or ctrl-shift-Q)
• Reproduce the issue
• Save the capture by right-clicking on the grid and choosing "Save all as HAR"
• Export the capture to a HAR file