Upgrade your browser to Firefox 8 and check

• getfirefox.com

Is that with Yahoo! mail?

What is the size of the Firefox window?

Does it help if you un-maximize the window and resize to with the mouse to the maximum isze possible of your screen?

See also:

• http://kb.mozillazine.org/Corrupt_localstore.rdf

I've had the problem too... for at least a month or more. It would happen when logging into yahoo mail. But it happens only with firefox... not explorer. I contacted yahoo and he had me first disable add ons... no change... and since it didn't happen with explorer, they said to contact firefox. So I followed the advice of cor-el's post (on this page) and made the text on my page smaller... It did fix the issue.... but, I liked the size of the text the way I had it. So, how do I get it back to that size, and not have that annoying message any longer? thanks!!

That may not be possible if zooming the page is causing the problem.
If you zoom the page then that affects the available screen width and height.

You can try to contact Yahoo (if you have the issue on their server) and ask them to change their code to remove that error message if the screen dimensions are correct.

You can inspect the currently detected settings by pasting this code in the Web Developer > Scratchpad (Shift+F4) and use Execute > Run or create a new bookmark and paste the code in the location field.

javascript:void(alert("Current Width: "+window.outerWidth+"\n\nCurrent Window: "+window.outerWidth+" x "+window.outerHeight+"\nScreen Available: "+screen.availWidth+" x "+screen.availHeight+"\nFull Screen Size: "+screen.width+" x "+screen.height+"\n\nwindow.outerWidth="+window.outerWidth+"\nwindow.outerHeight="+window.outerHeight+"\n\nscreen.availTop="+screen.availTop+"\nscreen.availLeft="+screen.availLeft+"\nscreen.availWidth="+screen.availWidth+"\nscreen.availHeight="+screen.availHeight+"\n\nscreen.top="+screen.top+"\nscreen.left="+screen.left+"\nscreen.width="+screen.width+"\nscreen.height="+screen.height+"\n\nscreen.colorDepth="+screen.colorDepth+"\nscreen.pixelDepth="+screen.pixelDepth));