I've been a user of Firefox for mobile since I first got a 'smartphone'. Just last night I reluctantly installed Chrome as Firefox kept crashing on my new favorite note taking app (dynalist.io if you're curious). While I know that the app should fix their code, so many modern apps seem to be almost entirely focused on developing for Chrome and don't care about Firefox, so it was the 'last straw' so to speak. I'd love to keep using Firefox, but it was just getting in the way of my day to day too much.