Epiphany handels opening bookmarks in new tabs different than Firefox. Usually, when you open a bookmark in a new tab via a click on the mousewheel, a new active tab gets opened, with the bookmark as content. Epiphany instead opens links from my bookmarks in the background.
This is quite inconvenient. When I browse the web, it's nice to open links you might find interesting in new tabs in the background. This way you browse e.g. through a news page and open article after article in the background. After browsing the mainpage you read the articles inside the tab. But when i open a page from my bookmarks I want it active now. I don't want to look through my list if open tabs to find it.
Firefox uses two "about:config" keys to define the way bookmarks/links are opened.
browser.tabs.loadBookmarksInBackground = false
browser.tabs.loadInBackground = true
These keys exist also in Epiphany with the same values. But Epiphany ignores the "browser.tabs.loadBookmarksInBackground" key.
I forgot to mention the version i'm using. Uptodate Gutsy Gibbon with
$ dpkg -l epiphany-browser
ii epiphany-brows 2.20.1-0ubuntu Intuitive GNOME web browser