Comment by pcx

We were using Xvfb with PhantomJS. Moving to a headless browser gave us the advantage of making sure everything is rendering just as we see in the GUI mode of that browser. This had a lot to do with moving away from PhantomJS. But it also removed the unkowns, Xvfb and other dependencies that came with it, from our stack. The lesser the unkowns the better I guess.