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I'm not too sure if this is an issue with the add-on, or with the script. But I felt it necessary to report it here.
1.3.0
With the userscript addon for Opera called Violent Monkey.
Apparently Opera has a user script capability already: http://www.ghacks.net/2008/08/10/greasemonkey-in-opera/
Re: @shuffyiosys:
Operas native implementation has been removed from newer versions since their switch to the Chrome/Chromium backend.