I enjoy the minimalism of Epiphany, though, as a suggestion, it would be useful to allow some implementation/configuration of security features beyond reliance upon Certificates.
My main issue is that I find it difficult to distinguish between the currently active tab and other tabs that are open; the box shadow is, in my opinion, not enough of a differentiator between the current active tab and inactive tabs. Owing to this small issue, I am constantly closing tabs unintentionally. Perhaps, to make another suggestion, a darker shade of Grey would help.
I would post this to the dev. area, but I don't know where it is.