Albeit is not advised to do so, it is not a strict convention that you should not use. I suggest reading this guide that explains the situations that VPN over TOR / TOR over VPN is advised. It’s very well documented. The Hitchhiker’s Guide to Online Anonymity
LibreWolf wouldn’t be recommendable to a non tech person doe to its changes to the browser to make it more privacy friendly. It breaks a lot of sites that the common folk uses day to day. My advise would be Firefox with uBlock as pointed out.