Feature wise, I always think there isn't much between the big brand browsers without extensions. They could do so much more. They may be better at CSS, JS and have some good debug tools in them these days, but as actual web browsing tools, there's plenty of ground to cover. Bookmarking, History, Link management and even Meta inspections/overviews could be much more user friendly and useful. Example: Chrome is a tabbed browser, and as such titles are lost until you focus on tabs or select a tab. And that bit of meta information is really important. Publish dates, shouldn't necessarily be embeded in HTML body, when a browser could extract that information from a header or a head. Navigation could be more fluent and the browser could aid in that. So usability wise, I'd say they are pretty feature lacking.