Today , I find big bug in Firefox . It cannot run flash application so I try to root cause of this problem from command ‘dmesg’ and I find :
|[ 8706.315022] npviewer.bin: segfault at 0000000000000035 rip 00000000f7ac02f6 rsp 00000000f5aa2d90 error 4
[ 8706.315628] npviewer.bin: segfault at 0000000000000000 rip 00000000f77afba8 rsp 00000000ffad3070 error
After that, I put this error message in Google and I find this link
I fixed problem by download this package
Install this package and restart Firefox again.