Here is the copy function used to copy the clicked item value into the clipboard https://searchfox.org/mozilla-central/rev/6e630edb09c3ab06d0103665b16c9ea7dce782c5/devtools/client/netmonitor/src/widgets/HeadersPanelContextMenu.js#108-126
Bug 1710573 Comment 6 Edit History
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Here is the copy function used to copy the clicked item value into the clipboard https://searchfox.org/mozilla-central/rev/6e630edb09c3ab06d0103665b16c9ea7dce782c5/devtools/client/netmonitor/src/widgets/PropertiesViewContextMenu.js#89-107