I have the below version of RHEL running on a VirtualBox VM on a Windows 10 host. Recently Firefox stopped working in the VM, and I don't know why. Chrome is working on the Windows host.

Linux vbox4rhel 4.18.0-477.15.1.el8_8.x86_64 #1 SMP Fri Jun 2 08:27:19 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux

Firefox won't load any page, whether the server's hostname or IP is provided. After hanging for a while, it displays an error message that the page can't be found.
I tried to install Chrome on the VM to see if the problem is internal or external to Firefox. The install failed as follows:

[root@vbox4rhel ~]# wget https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm
--2023-08-07 18:04:29-- https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm
Resolving dl.google.com (dl.google.com)... failed: Name or service not known.
wget: unable to resolve host address ‘dl.google.com’
[root@vbox4rhel ~]#

The contents of resolv.conf are:

[root@vbox4rhel ~]# cat /etc/resolv.conf

Generated by NetworkManager

nameserver 100.64.100.1
nameserver 68.105.28.11
nameserver 68.105.29.11

NOTE: the libc resolver may not support more than 3 nameservers.

The nameservers listed below may not be recognized.

nameserver 68.105.28.12
[root@vbox4rhel ~]#

I tried restoring old snapshots of the RHEL VM going back to the first one, but that didn't solve the problem. However Firefox used to work on this VM.
I don't know what might be causing this problem, any suggestions would be greatly appreciated..

Thanks