Well they gotta make the cut at some point. If Firefox waits forever then Chrome will just eat up all their users. Don't listen to the stragglers who want all

Well they gotta make the cut at some point. If Firefox waits forever then Chrome will just eat up all their users. Don't listen to the stragglers who want all the old Firefox behaviors supported forever. The wast majority of users don't care about Tree style tabs and vim style keyboard navigation or what XUL even is. They just want something snappy and fast like Chrome. That's how you get users to use your browser. That's how Firefox became popular in the first place. That's how any browser ever became popular. Yes even IE was faster than Netscape at one point, maybe because of nefarious practices by MS, but it was faster, and that's what the users wanted. It's all about the speed.