TB and FF may start behaving strangely if their settings or extensions are corrupted. In that case:
Shiftkey while double-clicking on the TB/FF icon
We keep this information here, just in case. And some recent pages may still have links to older sections…
VirtualBox is still an excellent product! But if your goal is to have a tight integration between Windows and Linux on the same machine, officially supported by Microsoft, you should have a look at the Windows Subsystem for Linux (WSL) and Ubuntu section
VB host: the machine and operating system where the VB program is running.
VB guest: the operating system running inside VB.
Microsoft has stopped the Windows 7 support in January 2020. You should now be using Windows 10 and reading the Windows 10 notes