screenshot
When selecting some templates in VisualEditor, a blue rectangle appears in the top left corner of the browser's window, and disappears when the template is unselected.
Encountered on https://en.wikipedia.org/wiki/User:Jdforrester_%28WMF%29/Sandbox?veaction=edit (see screenshot)
Firefox 21.0 on openSUSE 12.3
Version: unspecified
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=50074
Attached: