The headers of each web page are too wide. Takes most of the space on my screen in comparison to the page body were the most important part of the page "the content" displays. I use Yahoo mail and the list of e-mails before being opened have very little space in comparison to the header mail. This means I can only see 7 e-mails at a time .Most of the page is used by the header and the sides ( a frame). I have search on Firefox Settings and no luck