If a visitor uses Epiphany browser (webkit version) Piwik reports "Safari 531.2" as his browser.
This is a special case. Need to add test cases for Geck and Webkit user agent strings.
Keywords: browser, epiphany, visitors
Piwik doesn't support a browser being in multiple browser (layout engine) types/families, so Epiphany is simply classified as a WebKit browser. This is probably a reasonable assumption by the UserSettings plugin.