Starting User script in Greasemonkey

Is it possible to run a user script before the page and DOM lo开发者_开发问答ads?

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Only if the user script runs on google chrome atm. Greasemonkey may support this too someday:

// ==UserScript==
// @name My script
// @description It's really neat
// @run-at document-start
// ==/UserScript==

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As Erik Vold said, Greasemonkey cannot do this unless the browser is Chrome.

But, if this functionality is needed on any other browser, you can write an extension.