[Affected versions]: Firefox 56.0a1 (Build Id:20170607030210) [Affected platforms]: Windows 10 64bit [Unaffected platforms]: Ubuntu 16.04 64bit macOS 10.11.6 [Steps to reproduce]: 1.Launch Firefox. 2.Open Netmonitor via launchpad. 3.Access the https://en.wikipedia.org/wiki/Main_Page webpage via Launchpad. 4.Right click on any column. [Expected result]: The "Response Headers" option is displayed. [Actual result]: The "Response Headers" option is not displayed. [Regression range]: This is reproducible using Launchpad 0.0.75. I don't think that this is a regression.
See also bug 1376275 Honza
status-firefox57: --- → fix-optional
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