GM log
From GreaseSpot Wiki
Syntax
GM_log( message, level )
Description
Allows script authors simple access to logging informational messages in the Error Console. This can be helpful for debugging.
Level is optional and defaults to 0. Valid values are:
- 0
- info
- 1
- warning
- 2
- error
Examples
GM_log("Hello, World!");
Notes
GM_log is available in Greasemonkey version 0.3 and later.