I have been using firefox for a very long time now and have been very satisfied with the browser and the experience. I would not hide that there were times when I got disappointed, like their plug in container that made sure to save the browser even with crashing plug ins. Though that was a great idea, their execution which costs a lot of resources, makes the browser slower. Though, you could disable that by just a few changes to the browser's settings. I do get the occasional, why not Chrome but I do not like Chrome much as it makes some settings a little too complex which you can achieve easier on firefox.