Been with Firefox for years and never had a problem, unlike Explorer. Of course I’ve always used a reputable anti-virus since Windows 3.5 Have used Kapersky for years, but switched to PC Matic recently because ease of use. I don’t trust the Microsoft anti-virus bundle that comes with their OS, plus a huge memory hog with too many popup updates. I’ve found over time that if things work fine - don’t update. The few problems I’ve had is from that.
I use both Firefox as well as Explorer and I use Norton with Lifelock.
I've had Lifelock for years and they saved me much aggravation when I had some illegal use of a credit card.
The bank would have gotten me off the hook, but by the time the bank found out about the fraud, Lifelock had notified me and the bank and stopped the fraudulent use of my information.
Lifelock isn't cheap, but it works.