Do you want to increase the size of text in web pages, or in the user interface, or both?
For web pages, the best approach is to use the zoom feature. (Other methods such as increasing the minimum font size or overriding the fonts chosen by web pages often lead to distorted layouts.) This article has more information on how to use zoom: Font size and zoom - increase the size of web pages.
If this is a general problem that affects a lot of sites, you can use an add-on to set a new larger global zoom level. Here are a couple to check out:
Does that work?
Do you want to increase the size of text in web pages, or in the user interface, or both?
For web pages, the best approach is to use the zoom feature. (Other methods such as increasing the minimum font size or overriding the fonts chosen by web pages often lead to distorted layouts.) This article has more information on how to use zoom: [[Font size and zoom - increase the size of web pages]].
If this is a general problem that affects a lot of sites, you can use an add-on to set a new larger global zoom level. Here are a couple to check out:
* [https://addons.mozilla.org/firefox/addon/default-fullzoom-level/ Default FullZoom Level]
* [https://addons.mozilla.org/firefox/addon/nosquint/ NoSquint]
Does that work?