pdf file

I am trying to use wkhtmltopdf command to create and convert html pages to a pdf. However, I am running into errors though as follows when try to use wkhtmltopdf via a shell or Python script:
     Creating foo.pdf …
     ~/bin/wkhtmltox/bin/wkhtmltopdf: error while loading shared libraries: libXrender.so.1: cannot open shared object file: No such file or directory
     Error: foo.pdf not found.

How do I fix this problem with out installing the xserver on my Ubuntu or Debian server?
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I recently updated my Mozilla Firefox. Firefox now includes a built-in PDF viewer that allows me to see PDF files found on the web without a plugin. The built-in PDF viewer is enabled by default. However, I found that this pdf viewer is not working properly with various web-sites, and it works slowly. How do disable the built-in PDF viewer so that I can use the Adobe PDF viewer or other PDF viewer that is shipped with my operating systems?
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