If you ask me how many websites you visit that have Java applets, I tell you no one. They are few, few enough to make opening a page with Java applet a time consuming task! Yes, today I ran into one that uses Java applet for essential service, and I really need it.
I was using Chromium browser, searching the Internet about how to install Java plugin on Linux browser, I couldn’t find direct answer. I decided to search Kubuntu Software Manager (Muon) in my Laptop, and found it: icedtea-plugin, and as description says, it is web browser plugin based on OpenJDK and IcedTea to execute Java applets. Java was already installed, so it didn’t take time to complete installation.
sudo apt-get install icedtea-plugin
One thing to note here, that it is better to disable Java plugin if you’re not in a real need for it. It is well known for being security problems source, specially when you forget to update Java. Open browser plugin page and disable it from there, you can enable it later when needed.