Greasemonkey

As an avid FireFox user, I've come to love the various extensions available. I find them far superior to the add-ons available for the IE, and far more versatile. A great example of it is the Greasemonkey extension. Allowing me, the user, and not the webdeveloper to decide how the site will show up on my screen is a tremendous advantage.

One possible use that comes to mind is people who are vision-impaired and can use an enlargement of all the text on a page.

There are links on the main page of the Greasemonkey site, including ones that teach you what you can do and how to do it.

I'm off to learn the stuff ;-).