14 
If you’re an ardent user of Google Chrome and happen to use a Retina MacBook Pro, good news: the latest stable release of Chrome includes support for the high-res display. No longer will you have to use another browser or cause pain to your retinas. Download it here. [Google via Engadget]
Retina Display MacBooks Seem Inevitable Now
Why Your HDTV Is Already A Retina Display
Is This the New 13-inch MacBook Pro with Retina Display?
Installed then uninstalled. Chrome is still sh1t.
I used Firefox for years, mostly because of the extensions, then switched to Chrome but after getting my MBPR I started using Safari, to be honest as long as it has adblock, do not track and ability to sync/ back up bookmarks they all do the same job. Still FF allows you more customisation, something I have missed using Safari. Chrome is limited in it layout. Perhaps I will wait for FF to support retina.