browser problem ???

[eluser]najm[/eluser]
hello

i have a browser problem , my upload file pdf extension is very well with internet explorer but when i want to try with firfox 3 a message appear and tell me :
{file type is not authorized } it is very bizar please help me with any information about this problem

and thank you

[eluser]Yash[/eluser]
you need to define mime type in upload config.
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