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Right-click anywhere on the page, and then choose Inspect Element.
Select the Network tab.
Check if there is a little round red button on the top left of the Network tab. If there is, that means that the HAR file is already being recorded. If not, the icon should be grey. Click it. It should turned turn to red meaning you are now recording the HAR file.
Refresh the page and navigate as you usually do. This is the step where you’ll be reproducing the problem you are having, so it gets recorded in the HAR file.
Note: Do not open a new tab, as you are only recording the tab where you opened the Network tab.Once you completed all the steps and reproduced the error, right-click inside the panel.
Click on Save all as HAR with Content.
A Save As dialog will open. Save the HAR file to your computer.
And you’re done. Now you can get that file and attach it to the support ticket.https://connect.careerbuilder.com/s/article/How-to-create-a-HAR-file-within-Chrome - acho que podemos ou tirar prints daqui, ou tirar uns semelhantes 
Other supported browsers
If you are using a different browser like Firefox or Edge, you can follow this guide on recording a HAR file.