neil@parkwaycc.co.uk <neil.parkwaycc.co.uk@myrealbox.com> has granted Boris
Zbarsky <bzbarsky@mit.edu>'s request for superreview:
Bug 251274: [FIX]Error: [Exception... "Node was not found"  code: "8" nsresult:
"0x80530008 (NS_ERROR_DOM_NOT_FOUND_ERR)"  location:
"chrome://inspector/content/inspector.xml Line: 684"]
https://bugzilla.mozilla.org/show_bug.cgi?id=251274

Attachment 193251: Fix
https://bugzilla.mozilla.org/attachment.cgi?id=193251&action=edit

------- Additional Comments from neil@parkwaycc.co.uk
<neil.parkwaycc.co.uk@myrealbox.com>
Doh!

What confused me is that the menu is contextual but not a context menu in the
generally accepted sense.