For Firefox, there is an addon called Greasemonkey which helps you to add userscripts to your Firefox. It is a very useful addon as it helps you to add the userscripts that could help you to increase the options and facilities in your web browser.
But the problem was that we didn’t have this addon available for Google Chrome, one of the most popular web browser. But now we have got that problem solved. The Greasemonkey addon for Google Chrome has been introduced. It is called Greasemetal. Now you could add userscripts to your Google Chrome web browser.
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Just add the Greasemonkey addon to Google Chrome from here and then go to userscripts.org, search for the userscript you want and add it to Google Chrome using Greasemonkey extension. But some of the scripts might not work since they were made for Firefox. But you could get more userscripts for Google Chrome within a short time.