So many websites, especially news sites, have ads dispersed in between blocks of text. The ads often rotate, and in the process the ad screen space varies, even when the ads are somewhere else on the page. This causes the text to bounce up or down on the screen, sometimes taking it off-screen where one is reading. The result is having to constantly scroll up or down just to stay in the spot where one is trying to read. It doesn't seem difficult to make the browser freeze the view in the viewport while the ads are rotating elsewhere on the page. Thanks.