Why don't transparencies and drop shadows show right in pdf on Firefox ?

Hello,
We have display problems with transparencies and drop shadows in pdf that we upload on our website.
When these pdf are opened on Firefox the areas where we have used transparencies, drop shadows and color gradation end up in grey boxes.
This is a real problem for our society which only operates on the web.
You can find below some links to pdf that are particularly affected by this display issue :
- http://www.francebureau.com/doc/montserrat_bureau_ebenisterie.pdf
(grey boxes have appeared on the header, some pictures that were a bit transparent are missing on page 2)
- http://www.francebureau.com/doc/bureau_reglable_cervin.pdf
(same problem on the header, on page 2 color charts are completely lost in grey boxes, on page 3 same problems with the color charts)
- http://www.francebureau.com/doc/origami_fauteuil_pliable.pdf
(same problem on the header, on page 4 color charts are in grey boxes)
Viewed on different web browsers these pdf show fine.
The issue is that all our website and our turnover are based on these pdf documentations, which could be viewed by a customer using Firefox.
We are aware that changing our pdf viewer would be the solution but only for our computers and we cannot make all our customers change their pdf viewer.
Are you aware of this problem ?
Do you have a solution ?
Can you keep us in touch ?
Thanks

Hey I found out from the developers that this is actually fixed in version 29 via Bug 965861. Try the pdf viewer in the next version of Firefox, this will take care of that gradient. :-) Cheers.

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