From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3)
Description of problem:
It would be nice if the right-click menu shown under Edit Bookmarks
was also shown when right-clicking on an item in the bookmarks menu.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
It was an upstream decision to not do this. You could try to discuss
it with upstream using the epiphany mailing list or bugzilla.gnome.org.