How to Start Juniper VPN through firefox in 64 bit Ubuntu OS

Unless you need 64bit firefox , try the below steps

sudo apt-get purge openjdk-\* icedtea-\* icedtea6-\*
sudo apt-get install firefox:i386 openjdk-6-jdk:i386 icedtea-6-plugin:i386

sudo apt-get install xterm

OR

1) download and install 32bit java
2) Then install 32bit java through update-alternatives .

Ex:
sudo update-alternatives --install /usr/bin/java java /home/user/programs/java/jdk1.7.0_75/bin/java 10

3) restart firefox
 

else

follow the below link

https://www.java.com/en/download/help/enable_browser_ubuntu.xml