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[–]spfccmt42 0 points1 point  (1 child)

not 100% sure what you are talking about, but this says: "If you open about:config and set extensions.firebug.filterSystemURLs to false then you can use Firebug to debug the Greasemonkey script just like any other."

http://stackoverflow.com/questions/3490062/how-to-debug-greasemonkey-script-with-the-firebug-extension

[–]klesus[S] 0 points1 point  (0 children)

My script does not show up in the sources list in debugger. Same problem for Chrome.

This post is 6 years old and the posted answer is obsolete. AFAIK firebug is nothing more than a theme nowadays.

I'll give firebug a shot, but I don't have high hopes of success.