Incomplete rendering for very large SVG images

Hello,
I am building a php&mysql application which generates very large svg images.
Everything worked fine except for the fapt that when embedding a svg into
html (using either object or embed tag).
My embedded object was only rendered up to about 30 000 px width, the rest
of the rendered image is black.
In Firefox, when i choose "Show this frame in a new tab" it shows the image
at full size (60000 px X 10000 px), without any black areas.

I made a simple  http://network.quanttest.ro/teste/TestNet.php test case ,
which shows (if you scroll horizontally a little bit...)  the image rendered
partially and continued with the black background.

Could it be a firefox related issue? It works fine with Chrome...

Thanks,
Amy
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