Google Chrome for me. Like Hylian Viking I often use Google Docs, as well as Google Sheets and Google Drive. I also have a Gmail. It's nice to have all of that interconnected.
I'm surprised how many people still use Firefox here, I've been using Chrome for quite a while on my laptop and Safari on my iPhone. No real complaints for either.
I prefer Google Chrome cuz it saved my neck when my Acer died suddenly, when I logged into my account on my ASUS it instantly brought up all my bookmarks I thought were gone forever. Cuz of that I swear by Chrome.