If you open a popup window (gmail compose->shift on arrow is easiest) and then select the page menu and report a site issue, it opens a new tab in the popup window. It should open in the main window (we shouldn't do tabs in popup windows).
status-firefox57: affected → ---
Component: General → General
Product: Firefox → Web Compatibility Tools
Version: Trunk → unspecified
Note that we don't ship this on release, so I'm not too worried about this, though happy to review a patch.
Funky bug, thanks for reporting Mike. I'll see if I can get some cycles for this later on in the week.
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