Firefox white text in dark GTK themes

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http://forums.fedoraforum.org – I would like to set a theme for webpages only, with the default colors (you know, white for background, black for text, etc) how do i do it? or even better, is there a patch or something like that to install? thanks in advance! Edit: nevermind, solved, preferences > content > colors and unitck "use system colors" (HowTos)