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Black background when scroll down in website

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when i scroll down in the web site, a part of screen became black. i use the latest version of firefox. this problem not appear with others browsers Thank's.

when i scroll down in the web site, a part of screen became black. i use the latest version of firefox. this problem not appear with others browsers Thank's.

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That is likely a problem (bug) with Cairo on the Windows platform that causes Firefox to render the background after about 32000px (16-bit CSS pixels issue).

  • bug 671302 - cairo-gdi: large background-images and gradients don't work beyond ~ 32735px