I don’t use chromium on Linux, because the times I tried it, I see that it is not easy to close it (its service is in the background with an icon in the tray) and I see that it consumes CPU, as if you are doing some activity, type of cryptocurrency mined or similar. I suppose it will be easy to check, but I prefer not to waste time on it and I use Firefox. I’m lately trying Librewolf

It’s solid enough. I kept them closed to keep them in the original state

Only 4. You need a CD-ROM to complete the installation (https://www.serverbrain.org/troubleshooting-2000/install-by-using-setup-diskettes-and-a-cdrom.html)

Or NewPipe

KeepassXC, Passbolt