You could try using the Zoom feature to enlarge the text on web pages. This article describes how to increase fonts on a site-by-site basis: [[Font size and zoom - increase the size of web pages]]. If you want to generally increase the size on all sites, there are a couple of add-ons users regularly use for that: * [https://addons.mozilla.org/firefox/addon/default-fullzoom-level/ Default FullZoom Level] * [https://addons.mozilla.org/firefox/addon/nosquint/ NoSquint] Can you find a setting that works well for you?