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change my print size

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yesterday I did something that changed my print size so small I can not read it. where do I go to change it back to normal?

 When I copy the reduced data it displays it in normal size here.    
 thank you
yesterday I did something that changed my print size so small I can not read it. where do I go to change it back to normal? When I copy the reduced data it displays it in normal size here. thank you

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Check the Scale setting in the Print Preview window, 100% or Shrink to Fit is best.

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this has nothing to do with printing it is the email data being displayed on the screen

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That isn't "print" size, it's font size.

See if this helps you: https://support.mozilla.org/en-US/kb/font-size-and-zoom-increase-size-of-web-pages

If you inadvertently change the zoom level of a domain, Firefox will remember that setting and use it, until you change it again. I can only guess that using the Ctrl key while scrolling the page adjusted the zoom level on a web-mail page. Been there, done that myself.