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error slider in Firefox 19.0

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my page www.forum.dariuszkaczorowski.pl, Please check the slider to the right forum, Firefox 19.0 - Slider does not extend to 100%. Extends if we move to another menu or slider.

my page www.forum.dariuszkaczorowski.pl, Please check the slider to the right forum, Firefox 19.0 - Slider does not extend to 100%. Extends if we move to another menu or slider.

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I do not see anything on that page that looks like a slider. There is something that looks like a button at the end of a bar with the label "Szukaj". Is that the slider? It does not seem to slide.