All of them (literally) - Chrome, Vivaldi, Brave, Edge, Firefox 56, Waterfox.
I've got a terrible habit of just opening new tabs to view things, so I ended up with 2k tabs (yes, 2,000) in Chrome, used Vivaldi for a bit and ended up with another handful of tabs, use Edge for work related stuff and Microsoft rewards, Firefox (56) stopped being supported so tried to move to Waterfox for the legacy add on support etc.
I started using Brave a few weeks back and trying to migrate away from Chrome (and being more sensible with my usage!)