The NYTimes page sets specific width (970px) to that content and thus will Firefox not automatically extend the width to fit the current window width. You would have to zoom the page to make it use the full screen estate.

Thank you for your answer, Cor-el. Unfortunately, that is not the problem. The issue is happening with a variety of websites. Google News and Amazon utilize the entire window. NY Times and Target do not. Drudge Report is fine, Huff Po is not. When I zoom, the text gets bigger and bigger, but the empty side columns remain.

Make sure that you are using full page zoom and not "Zoom Text Only".

• View > [] "Zoom Text Only"

• Tap the Alt key or press F10 to show the Menu Bar

Thanks, Cor-el. We're getting there. I have a Mac, running OS 10.9.5.

I did as you suggested, and it does make the page as large as the window, however the text and graphics are huge and not manageable. Any other ideas?

Thanks!

Sounds that you need a trade off and not zoom the page that much to fully cover the available width, but only zoom that much and keep the size of the elements within acceptable proportions.

Is there a tech support phone number that I can call? The latest response is a recommendation to adapt to the problem rather than a fix for the problem.

Thank you.