When using the Mozilla Firefox web browser, you may find the default font size either too small or too large. To better suit your needs, you can adjust the font size and style in Firefox.
This article will guide you on how to change font size and style in Firefox.
Step 1: Open the Firefox browser.
Step 2: Select Tools -> Options. Alternatively, you can click the Open Menu icon -> Options.

Step 3: In the Options menu, choose the Content tab.

Step 4: Under Font & Colors, pick the Font type in Default Font and select the size in Size, then click OK to save the default font size and style.

From now on, you can comfortably adjust the default font size and style in the Firefox browser to suit your needs. We hope this article can be helpful to you. Wish you success!
