How do I get my screen back to 80%

Images are too large for the screen. At one time there was a fix for this, but I have forgotten what it was.
I have windows 7

You can set the layout.css.devPixelsPerPx pref on the <b>about:config</b> page to 1.0 or on Windows 8 to 1.25 and if necessary adjust layout.css.devPixelsPerPx starting from 1.0 in 0.1 or 0.05 steps (1.1 or 0.9) to make icons show correctly.
*http://kb.mozillazine.org/about:config
See also:
*https://support.mozilla.org/kb/forum-response-Zoom-feature-on-Firefox-22
Use an extension to adjust the text size in the user interface and the page zoom in the browser window.
You can look at this extension to adjust the font size for the user interface.
*Theme Font & Size Changer: https://addons.mozilla.org/firefox/addon/theme-font-size-changer/
You can look at the Default FullZoom Level or NoScript extension if web pages need to be adjusted after changing layout.css.devPixelsPerPx.
*Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/
*NoSquint: https://addons.mozilla.org/firefox/addon/nosquint/

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