This screnshot displays the second step "Verify Compatibility" of the Switch Theme wizard.
A pop up with heading Applied "Theme 25 - Blue Responsive" mappings is displayed over the Switch Theme wizard. This pop up displays the following information:
Success 
42 out of 42 template mapping(s) were recognized by this bookmarklet.
Of these, 13 template mapping(s) were altered.
Close button (mouse pointer)