How to determine why a Greasemonkey script is not running [duplicate]

you can write logs everywhere in your scripts to get better traces of what if being done in them:

GM_log("Hello, World!");

http://wiki.greasespot.net/GM_log

More info: http://wiki.greasespot.net/Greasemonkey_Manual:Other_Useful_Tools#JavaScript_Console

Another tip: Take a look at the whole greasemonkey wiki. They have a lot of good stuff in there: http://wiki.greasespot.net/Main_Page

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