They've been chasing Google's tail for a while now. They keep making decisions that make little sense. Given the drop in user count I'd say those decisions aren't even paying off. Every time I update FF, I actively dread to see what they ruined this time.

Sadly, creating a new browser is impossible these days, unless you're sitting on a very considerably sized pile of cash. There's over a thousand W3C specs, and you'll need to implement most of them in order to have a functional browser.

It's maddening that the steward of the best browser codebase is doing such a shitty job. They fired a whole bunch of people last year, even though they seem to sitting on plenty of cash, they don't seem to give a crap about what their users actually want. But, sadly, there is no alternative, and there won't be.

I'm sort of used to it by now, but I also don't see it as a real reason to stop using Firefox. Chrome also changes. So how big of a factor would UI changes be in this user loss? I'm suspecting there are more trivial and indirect causes too, such as people changing machines: Firefox isn't pre-installed, and then they just pick whatever that also works.

Its funny that you mention the not really annoying shit and forget about the push for pocket, the constant push for some of their free services like firefox sync, send, vpn, etc that, the reappearing ebay bookmark i deleted like 12 times by now, the removal of live bookmarks, etc... and those are just the things they can control.