Changing the font size or color on the screen/monitor

• does NOT affect the print size
• can cause problems in displaying websites on the screen/monitor
• See - https://support.mozilla.org/en-US/kb/settings-fonts-languages-pop-ups-javascript (it says near the top "The Content panel contains options related to how websites are displayed.")

Print font size is determined on the Print display

• You can un-check "Shrink to fit" and then set your percentage, if you choose, but text may run off the right side of the printed page.
• For Printing problems see -
  • https://support.mozilla.org/en-US/kb/how-print-websites
  • https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox
  • http://kb.mozillazine.org/Problems_printing_web_pages

Hello lizramadhan, on mac it is not in Tools > Options > content this is for windows

for mac you find the content from, Firefox menu and select Preferences... to access the preferences window and then Content panel

see: Firefox options, preferences and settings

Settings for fonts, languages, pop-ups, images and JavaScript

Menu differences in Windows, Linux, and Mac

thank you

It is better not to increase the minimum font size, but use an extension to set the default page zoom to prevent issues with text not being displayed properly.

You can use an extension to set a default font size and page zoom on web pages.

• Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/
• NoSquint: https://addons.mozilla.org/firefox/addon/nosquint/

An excellent AD-On for Firefox to correct your problem is the Theme Font & Size Changer..like all Ff addons, it's free and has a very small footprint on the top right of your browser.

Check it out at https://addons.mozilla.org/en-US/firefox/addon/theme-font-size-changer/?src=ss