Safari does allow users to set a minimum font size for all websites: Mac users who would like to use a specific font for all websites should use Firefox. *Safari only allows users to make font changes in websites that have not previously specified a particular font.

In the Appearance tab, select desired Standard font.

In Safari, click on the Safari tab in the upper left hand corner of the screen.

In Firefox, click on the Firefox tab in the upper left hand corner of the screen.

Click Text Size and select your desired default font size.

Click the Page button on the upper right hand corner of the screen.

Click OK again to exit the Internet Options box.

Under 'Webpage font,' select your desired default font.

In the Internet Options window, select Fonts.

Make sure the boxes for 'Ignore font styles specified on webpages' and 'Ignore font sizes specified on webpages' are checked.

In the General tab, click on Accessibility.In Internet Explorer, click on the Tools button on the upper right hand corner of the screen.Make sure the 'Allow pages to choose their own fonts, instead of my selections above' box is unchecked.In the Content tab under Fonts and Colors, select your desired default font & size from the drop-down menus.In Firefox, click on the Tools button on the upper left hand corner of the screen.This document explains how to choose the default font & size for Internet Explorer, Safari, and Firefox on Mac and Windows computers.

Mac increase font size browser