No answers yet but look at other threads, someone will no doubt provide an answer soon.

Meanwhile all I can suggest is

• Have you tried scrolling and zooming ? /questions/847465
• may also be interested in looking at possibly related /questions/847840

With all the threads about this issue that have been posted today, it would have been nice if one person posted a screenshot of this problem. Firefox 5.0 has been out for over two weeks now, so I doubt if it is a problem with Firefox 5.0 - unless all these users didn't use their PC and Firefox since 6/21. I suspect an add-on that was updated today??

https://support.mozilla.com/en-US/kb/Adding+screenshots

Some users are finding it is the Babylon toolbar causing this, anyone wish to confirm this, or say something else causes the problem ?

Three people reported this problem in the French support forum. It was indeed caused by the Babylon toolbar.

go to View Menu -> Zoom -> click "Reset"

go to View Menu -> Page Style -> select "Basic Page Style"

go to Help Menu -> select "Restart with Add-ons Disabled"

Firefox will close then it will open up with just basic Firefox. If above suggestions don't work then

go to Tools Menu -> Add-ons -> Extensions section -> REMOVE any Unwanted/Suspicious Extension (add-ons) -> Restart Firefox

You can enable the Trustworthy Add-ons later. Check and tell if its working.