It's tragic really
Firefox used to be the savvy user's browser. And it was darn good at being that. It was also good enough that let's say "non-geeks" started to see the value too. But then Chrome got big, and I swear someone at Mozilla must have said "See boys, that's what we need to be." But they can't out-Google Google, so that was never going to work. Instead they just made a browser that doesn't really have a target audience anymore. The old users mostly hate the changes, and I can't see any reason for users to pick it up when almost all the changes are to make it more like Chrome, the browser they're probably already using.