I have Windows 10 as host. "Try Ubuntu" using Oracle VM Virtual box. When I open firefox, the application comes up, but freezes. I have to Stop ubuntu all together. Appreciate if you could provide me with steps to rectify this problem
You might not have given the guest OS enough memory in Virtualbox. Open the Virtualbox settings and set it to 2048 and retry Firefox... or boot directly to a Ubuntu Live DVD/USB and see if Firefox works OK for you.