Disappearing scrollbar in Mac OS 10.8

I recently upgraded my Mac operating system from OS 10.6 to OS 10.8. After doing so I found that the scrollbar on my Verizon email page had disappeared so it was impossible to click on messages at the bottom of the page. This was the case whether I accessed my email using Firefox or Safari. The problem turned out to be with the scrollbar default setting in OS 10.8: you need to go into Mac Preferences, and in the General>Show Scrollbars check the "Always" box.