Generate a HAR file in Firefox
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Open Firefox and go to the page to be recorded.
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Click the more menu() and then Web Developer > Network.
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In the developer tools docked tab select Network.
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Go to the page where the issue occurred and reproduce the issue. The page automatically starts recording as you navigate.
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Right-click anywhere in the File column and select Save All as HAR.
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Save the file.
Generate a HAR in Safari
If you don’t see the Develop menu in the menu bar.
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Select Safari > Preferences.
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Click Advanced.
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Select Show Develop menu in menu bar.
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Open Firefox and go to the page to record.
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From the Develop menu select Show Web Inspector.
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Select the Network tab.
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Select Preserve Logs.
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Go to the page where issue occurred and reproduce the issue.
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Click Export and save the HAR file.
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Save the file.