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I have Firefox 19 and the screens are narrow. How can I get full width screens, like I get in IE? Full Screen command only makes my screens taller, not wider.

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I just got a new Dell Optiplex computer with Windows 7. I installed Firefox 19 on it. The web pages come up narrow, with borders on each side. So the content of the screen is smaller than what I've gotten in the past with Firefox 3.6 on my previous computer. I did the Full Screen command, and that only made the screen taller rather than giving me a full screen (such as I get with the same web pages in Internet Explorer). I've also tried enlarging the text, but that throws off the format of the web page so some parts of it overlap.

What can I do to get a full screen, including full width?

There is a box below this Details box called "Troubleshooting Information" which says I should click Allow and then click Install. Since I don't know what would be installed on my computer, I did not do it.

I just got a new Dell Optiplex computer with Windows 7. I installed Firefox 19 on it. The web pages come up narrow, with borders on each side. So the content of the screen is smaller than what I've gotten in the past with Firefox 3.6 on my previous computer. I did the Full Screen command, and that only made the screen taller rather than giving me a full screen (such as I get with the same web pages in Internet Explorer). I've also tried enlarging the text, but that throws off the format of the web page so some parts of it overlap. What can I do to get a full screen, including full width? There is a box below this Details box called "Troubleshooting Information" which says I should click Allow and then click Install. Since I don't know what would be installed on my computer, I did not do it.

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The Troubleshooting Information extension adds some useful information to your post, but in this case, I don't think it's really needed.

Zoom is your best bet. To make it work for you, I have two suggestions.

(1) Switch from "text only" zoom to "full page" zoom. This is proportional like in IE.

View menu > Zoom > uncheck Zoom Text Only

If you are using the compact menus with the orange Firefox button, tap the Alt key to display the full classic menu bar.

(2) Install an extension that can default your view to a higher zoom level automatically to save time when visiting new sites. Here are two candidates:

With that combination, can you minimize your eyestrain? :-)

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In case I misinterpreted your reference to making text larger, two more things:

(1) Don't override website font sizes unless it's critical for a particular site. On most sites, it can cause visual chaos.

(2) More background on zoom: Font size and zoom - increase the size of web pages

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NoSquint is helping so far - thanks!