I don't see why anyone would use multiple. I use Opera.
you're thinking to be able to keep everything logged in on different sites, keep in mind there is a lot of people who do things like having a new amazon account every month to get free prime while keeping their main amazon account on their main browser... it's nuts to me but if you jump through a few hoops you can get things delivered a day faster for free!
for our fallen homie, Internet Explorer.... I'll always remember seeing clickbait celeb news on msn home before using you to download a better browser!
Why not check me out on youtube and help me on the way to 2k subs over at www.youtube.com/stormcloudlive