In fact, when you install a user script in Chrome, it actually installs as though it's a regular old extension. That means, as the original Greasemonkey developer and Google employee Aaron Boodman points out on the official Chromium Blog, that Chrome users now have roughly 40,000 more extensions to add to the list.
Some scripts won't work with Chrome just yet because of differences between Firefox and Chrome, but it looks like that number is somewhere around 15-20 per cent. Not bad, Chrome. It's getting more and more tempting to consider Chrome as a viable Firefox alternative every day.
The improved support for user scripts should work on any Chrome version over 4, which includes the stable version on Windows and both of the beta versions on OS X and Linux. If you'd like to try out a few good user scripts — for Chrome or Firefox — our list of the top 10 Greasemonkey user scripts is a good place to get started.
40,000 More Extensions! [Chromium Blog]