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When I run a .pdf file from a DVD with Firefox it reads it like the picture shows:

picture here

SU609536 example

Why is this happening?

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This is the binary content of your .pdf file which is simply shown as text. You can change the behaviour by changing the action for pdf files in settings -> applications -> Portable Document Format (pdf). Just set the action to "Preview in Firefox" for the integrated pdf reader or "download file" or whatever you like to do with the pdf file.

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