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Firefox 1.5 (Gecko 1.8) and later support the CSS properties -moz-column-count, -moz-column-width, and -moz-column-gap, inspired by draft CSS3 module: Multi-column layout.
Newspaper style columns are easier to read on a wide screen than long lines of text. They make better use of screen real estate.
This extension allows you to apply those CSS properties to the main content of whatever web sites you like. It is preconfigured to apply them to Del.icio.us, Digg, Wikipedia, and several others - though you can turn this on or off.
WARNING: Some XHTML/XPath knowledge is required to configure this extension for other sites. Owing to a bug in Firefox 1.5, this extension currently works imperfectly on some sites. Firefox 2 works better, but some sites still don't render that well in columns.
For more information, see:
Using Digg as an example: