possibly your screen resolutions was changed on you. you may have to go into safemode and change it.
I use - W7, Ultimate, Firefox 38.0.1. Yahoo mail.
I have made no technical alterations to my computer recently that might cause any change in/to the viewed page. I have only downloaded HP Diagnostic doctor for my HP Printer - which was unplugged from the USB port!
Starting about 4 days ago, the opened items in my Yahoo mail - eg. notices from Bank, opened pictures etc - appeared too large to read without having to scroll from side to side.
As from yesterday, I am unable to scroll to the side to read the print or see all of the photo.
I have right-clicked on the open desktop and tried to adjust the resolution under the "Properties" tab. This has not allowed me to scroll completely to the right in order to read the writing or see the part of the photo which is to the right of the open and visible part.
I have also tried enlarging and minimising the view by holding down Ctrl and using the mouse-wheel to enlarge or minimise the page. This was also unsuccessful.
There is obviously something that I can do to overcome this but not being very technically minded, I am not able to discover how!
I would be grateful for any advice.