Charmtrap I was in your boat for the longest time. And of all things, what pulled me out of Firefox wasn’t my desktop browser use. It was getting a phone running android. Holy cow I LOVE the integration features I get between phone and other devices running it using my login.
Girlfriend messages me on Hangouts? I get the notification on my phone and all Chrome browsers.
Bad traffic going home? My phone alerts me and I get a pop up on my desktop because I’m logged in to chrome there.
Trying to find directions to somewhere? Chrome asks me if I want to send it to my phone so I’ll have it.
I could go on, but that was the final nail that killed FF for me. I still have it loaded, but once I synced over everything (something they made way too easy as well,) I was done. I’m glad to see them doing well, but I’m not sure I could go back, now.