I get the same results as Cliff sometimes, but only very briefly, just before a page loads fully. This is with Windows 7. I only have 1mbs DSL, which could contribute to the slow load.
Newegg seems to be one culprit in causing it.
With that said, I do much better with Firefox on XP, than I do with Windows 7.
Ignore the following as anecdotal:
With XP, I can literally open hundreds of pages. With the 32 bit Windows 7 rig I'm using now, Flash crashes, pages literally strobe from pure back to what is supposed to be on screen, or just black out altogether. Same ISP, same modem / router, two entirely different results. I thought the issue could be from the graphics needs of Aero, so I turned it off. Same problem.