User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; fr; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.8 (.NET CLR 3.5.30729) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; fr; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.8 (.NET CLR 3.5.30729) As the header is stable, when opening a page, the whole page twitches. It seems to scroll one line and and goes back every half second. I can stop it by clicking on an another tab and going back to the first one, then the screen becomes stable. Reproducible: Always Steps to Reproduce: 1.open Firefox 2.click on any tab 3. Actual Results: This happen at every start of Firefox.

Please read: http://support.mozilla.com/en-US/kb/Window+shakes

(In reply to comment #1) > Please read: http://support.mozilla.com/en-US/kb/Window+shakes The bug have been resolved thank to this link.

(In reply to comment #2) > > *** This bug has been marked as a duplicate of bug 247116 *** The bug have been resolved thank to this link : http://support.mozilla.com/en-US/kb/Window+shakes