While Facebook does not offer a native way to alter the font size and color of the site, it is possible to do so via the extensions available for the Google Chrome browser. These extensions are small applications that run inside the browser, extending the functionality. Changing the font size and color of Facebook can make it easier to read the information if you have any visual impediments. Using the correct extensions, these changes are confined to the Facebook domain and not any other websites that you visit. Writer Bio
