What is The Best Browser For Duolingo?
I tried IE, just to see how it looks there ;) It was very buggy, at least for me.
I don't really use Opera or Safari much, so I don't have a confident opinion about them...
Firefox - at first it looked okay, but after some time it started to look kind of outdated, also it crashes a lot because I usually keep many tabs (30 and up, sometimes even into the 100s) open. Firefox can't deal with that.
The best one I used so far is Chrome: it handles multiple tabs pretty well, has many extensions which are immensely useful when it comes to my style of using the net. And it doesn't require Flash, which is a big plus since it can cause crashing when overused. My vote would go for Chrome ^^