I understand that you have to focus your resources onto Chromium; but don't count Firefox out yet. The way Google is behaving nowadays coupled with the progress that Firefox keeps making, there will be a sizable group of us Firefox users for the foreseeable future. And, we're a vocal bunch, too!
I’ve also noticed a small uptick in my circle of friends abandoning chrome for firefox lately. I personally also switched back to firefox this year after years of using only chrome.