This has been going on since the release of GhostBSD10.3 for me only under Virtual Box. GhostBSD installs fine. I am also up to date with all software updates. When in FireFox on a Web Page and I used the Mouse Scroll Whell to scroll back to the top of the page the Web Page will do a full page back like I clicked on the Page Back Button in the upper left of the Browser Page. This has been going on for about 6 months now. I am not sure if this is a GhostBSD issue or a FireFox issue under Virtual Box.
I have also installed GhostBSD10.3 on different machines under Virtual Box both Mac and Windows and the problem is always there only with GhostBSD 10.3 running under Virtual Box. Version 10.1 worked perfectly.