With this latest update, the userChrome.css file is either partially or totally ignored. Thus, tab bar is back at the top. When I use Firefox extensively like I do, I develop a muscle memory for where things are. In my opinion, and like many, many other people who agree with me, having the tab bar at the top is completely illogical. I'm sure at this point that Mozilla has received enough negative feedback about having the tab bar at the top that they are aware that this is a problem for a lot of people. One would think that they actually might want to consider making the tab bar location optional in order to keep end users. For example, in my case this is such a huge issue that I'm now looking around for another browser. I simply don't have the time to continually squander on overcoming major paradigm shifts.
