Google Chrome is the most popular browser today. Elementary OS ships with Midori which looks beautiful in Freya, but still most people change it to Chrome/Chromium or Firefox.
Now here comes the good news for Chrome/Chromium users, there’s a theme for their browser which looks much better in elementary OS than the original one. In fact, there are two versions, a Freya theme and a Freya theme with classic colors. The latter has more natural blue loading circle, among other small resets. In addition there’s also a scrollbar theme to make your browser look even more native.
Update: the classic colors theme has been merged into the main Freya theme.