I answered a question from a new Firefox user about font sizes. She had just installed Firefox and noticed that the fonts were smaller than those that she was used to seeing in Internet Explorer.

The “problem” is that we, as users, can change our default fonts and font sizes in our web browsers. Firefox even offers more flexibility than does Internet Explorer.

In Internet Explorer, we can make a temporary change by clicking on View, Text Size, and then pick any of five different relative sizes. By relative, I mean that they have values like “larger” and “smaller,” which get applied to the current font size on the web page. Firefox has a similar function on its View menu.

Read more Changing Your Web Browser Fonts and Font Size