I refused to touch for over 15 years because it was incredibly slow each time I tried. Now that I'm trying to get out of Google's sphere of influence, I'm kind of forced back into it (Safari just doesn't feel right to me). Speed seems much better than it used to be and I can't really tell any difference between it and Chrome. Memory usage is an absolute disaster though. There are times where I only have 4 tabs of HN open and Firefox will be consuming over 9 GB of memory.
Right now I'm sitting at 3.6 GB used for just a couple tabs of programming documentation. Madness.