On Scroll my web page appears with black background? instead of white; not in chrome or IE

8/3/2014,
Dear Sirs,
I own www.aimcmp.com and I am a computer expert of more than 30 years.
On this one page, of my six pages, Computer Help Technical http://www.aimcmp.com/Computer%20Help%20Technical.php
If you scroll to the bottom you can watch the background switch from white to black and again from black to white if you scroll up. This problem is not present with Google Chrome or IE8; therefore you got a serious problem with you browser. Please fix it and notify me when completed.
I made screen shots of the problem but see no way to upload them?
Alan R.

On Windows this issue can be caused by the DIV container that is higher than 32000px that causes the background image to stop.
*[https://bugzilla.mozilla.org/show_bug.cgi?id=671302 bug 671302] - cairo-gdi: large background-images and gradients don't work beyond ~ 32735px
*[https://bugzilla.mozilla.org/show_bug.cgi?id=692350 bug 692350] - Table background stops repeating after ~1600 lines
<i>Please do not comment in bug reports<br>https://bugzilla.mozilla.org/page.cgi?id=etiquette.html</i>
You can try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
You need close and restart Firefox after toggling this setting.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

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