The font size increases automatically and the window will not let me scroll
When I launch 3.6.12, two things happen: The font size increases by itself to the largest font available, and the scroll bar doesn't work. I can scroll down the page, but as soon as I stop, the window resets to the top of the page.
Running Win XP SP 3.
Opaite Mbohovái (1)
Check that you do not run Firefox in compatibility mode or with a reduced screen resolution. Make sure that you do not run Firefox in compatibility mode. You can check that in the "Compatibility" tab in the Properties via the right-click context menu of the Firefox desktop shortcut. Make sure that all items are deselected in the "Compatibility" tab of the Properties window.
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/appcompat.mspx