Hi, since doing the SL upgrade, I've been having a number of interface/firefox issues, such as: - sometimes, the page within the browser window 'shakes' back and forth. As if I were moving the horizontal bar back and forth. (that bar shouldn't be there anyhow). - 'tooltips?' don't stay visible. If I hover over a link such as 'mac applications' above, a tooltip appears but then vanishes straight away. - often when scrolling within a page, i lose the ability to go up and down with the arrow keys or the scroll wheel. Only solution is to move the handles on the right of the window. - drop down boxes don't work. they vanish straight away. anyone else had these issues with firefox? Safari seems fine.