I use Firefox 95% of the time but I'm at school now using Microsoft Edge because we don't have Firefox.
I use chrome on my desktop, and I use Blue Moon on my laptop, Blue Moon is a compact browser for very VERY slow machines.
Been using Opera for 6 years. Only thing I hate is that the UI design changes slightly every now and then with updates, but it's bearable.
I grew up using the MSN Explorer, which was known to me as just, "MSN." I do believe it is still supported, though the last major revision was in 2014. It may only be for MSN dialup customers now, even though I remember we still used MSN Explorer when we got DSL. And yes, there still are MSN dialup users. As to answer the thread, I currently use Chrome on my desktop and Laptop, and Firefox on my phone and work laptop. Trying to make the switch to Firefox on all my devices for privacy reasons, but I am so entwined in the Google suite, I'm not sure it will make any difference.
Used to use Chrome, then Opera, and now Vivaldi, which is my favourite so far. Least problematic too.