I already installed mozplugger

sudo apt-get install mozplugger

Then I changed the pdf part of /etc/mozpluggerrc into the following:

application/pdf:pdf:PDF file

application/x-pdf:pdf:PDF file

text/pdf:pdf:PDF file

text/x-pdf:pdf:PDF file

    repeat noisy swallow(evince) fill: evince "$file"

    ACROREAD()

    repeat noisy swallow(kpdf) fill: kpdf "$file"

    repeat noisy swallow(Xpdf) fill: xpdf -g +9000+9000 "$file"

    repeat noisy swallow(okular) fill: okular "$file"

    GV()

    repeat noisy fill exits: evince "$file"

Of course I setted the application settings for pdf to Mozplugger.

Sometimes it works but mostly it dosn't. I don't know why. What do I have to do?