I get a partially transparent checkerboard pattern when I open some pdf documents in the Firefox browser..

If the document is saved and reopened with a pdf reader, pattern is absent. How can I get rid of this annoyance ?

Which viewer do you use to display the PDF file in Firefox?
Is that the PDF viewer extension ([https://addons.mozilla.org/firefox/addon/pdfjs/]) or the Abode Reader plugin or another extension?
Try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://hacks.mozilla.org/2010/09/hardware-acceleration/

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