GM log
From GreaseSpot Wiki
Syntax
GM_log( message )
Description
Allows script authors simple access to logging informational messages in the Error Console. This can be helpful for debugging.
The message string is required.
Examples
GM_log("Hello, World!");
GM_log("Warning, " + someInputField.value + "!");
Notes
GM_log is available in Greasemonkey version 0.3 and later.
GM_log and Firebug
Since Firebug 1.0, extensions.firebug.showChromeMessages must be set to true for GM_log messages to show up in the Firebug console.
