How to Change a Font on Facebook
Facebook doesn't let users change their font settings from the site, but you can use browser settings and add-ons to customize your Facebook experience.
Facebook settings don't allow users to change font size or style, but users can use browser settings and add-ons to create the viewing experience they want.
Simply want to make the font on Facebook larger? Click Ctrl-+ while using any browser.
Change a Font on Facebook Using Firefox Browser Options
To change a font using the Firefox browser options, select the Tool menu, displayed as three horizontal lines in the top-right corner of the browser and select Options.
Select Content and Advanced.
Select the desired font settings, deselect Allow pages to choose their own fonts, instead of my selections above and click OK.
Change a Font on Facebook in Chrome Using Fabulous
Select the Tool menu in the upper-right corner of the Google Chrome browser. Click on More Tools and Extensions.
Scroll to the bottom of the Extensions page and click Get more extensions.
Type Fabulous into the search form. Find Fabulous for Facebook in the results, and click the + FREE button. Then click Add.
Go to Facebook.com and select the Fabulous menu button, displayed as a blue circle containing a white, cursive F.
Use the slider menu to adjust font style and features.
Change a Font on Facebook Using Internet Explorer's Browser Options
Select the Tool menu, displayed as a gear in the top-right corner of the browser. Click Internet Options and select the General tab.
Near the bottom, click on Fonts.
Select the desired font features and then click OK.
Back on the Generals tab, click Accessibility.
Select the three options found under Formatting and click OK.
Most methods of changing a font apply to every website you visit, not just to Facebook.