That's already known upstream:
http://bugzilla.gnome.org/show_bug.cgi?id=351814
** Changed in: epiphany-browser (upstream)
Importance: Undecided => Unknown
Bugwatch: None => GNOME Bug Tracker #351814
Status: Unconfirmed => Unknown
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Epiphany crashed when deleting all boomarks
https://launchpad.net/bugs/68420