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Firefox HAR record

Firefox has a built-in extensions which allows to easily record requests and responses and export them as HAR format.

firefox-record

Quick Video explaining how to record HTTP requests with Firefox

How to record

The following procedure explains how to record HTTP as an HAR file with Firefox:

  • Start Firefox,
  • Then press CTRL + SHIFT + P to start an incognito session,
  • Press CTRL + SHIFT + I to display the developer toolbar,
  • Select Toolbox options tab, and check enable persistent log,
  • Go back to_Network_ tab
  • Navigate to record HTTP traffic,
  • Right-click on any request and select Save All As HAR.

Info

In case you do not have Firefox, you can download our sample HAR file.

Create Virtual User: Import HAR

Upload the newly created HAR file to create a virtual user:

Create Virtual User from HAR

Simply drop the file in the HAR area or use the Upload new HAR file button and hit Next.

Warning

If a response/request is truncated by Firefox follow this procedure:

  • Type about:config in the URL bar to open the configuration page
  • Increase the values of those parameters ("0" or "-1" won't configure them as unlimited) : devtools.netmonitor.requestBodyLimit devtools.netmonitor.responseBodyLimit

Before uploading, you can adjust the import options: ad blocker, static resources and think times.