I upgraded to Firefox 4 as advertised/suggested. Since switching from older version, I can barely see the tabs or the "x" to close a tab. I have to move the cursor until a dialog box appears telling me I'm over the close button. They are all very translucent and dark. I also can't get the new tab page to default to the search box. I still get the Google search page, but the cursor now defaults to the URL box instead of the search box, as the older version did.