The following instructions have only been tested on Windows 10.
- Navigate to Control Panel > Ease of Access > Ease of Access Center > Make the mouse easier to use.
- Check "Activate a window by hovering over it with the mouse" and hit OK.
Once "Focus follows mouse" is enabled, you may find it helpful to prevent windows from being brought to front on focus:
- In the registry editor, navigate to
Computer\HKEY_CURRENT_USER\Control Panel\Desktop. - Update
ActiveWndTrkTimeoutto 300.