The first thing that needs to be done is to check for the existence of a Java plugin in your browser. This, thankfully, is a simple task. First, open Firefox (obviously) and open a tab. Type about:plugins in the tab and hit Enter. This will show you a listing of all the plugins your browser can currently use. Download and install Java from Java.com, if it isn't already installed. Chrome must have Java.

If you are having trouble opening a jnlp file (e.g., for IPMI console access) you can try some of these steps.

Tell Firefox to allow pop-up windows for this site

Tell Firefox how to handle the filetype .jnlp

Tell it to open it with /usr/bin/javaws

Tell Java to allow the site to run applications

If you get “Application Blocked by Java Security” you can fix that by editing an exceptions list.
Modify file ~/.java/deployment/security/exception.sites

Each line in this file should be a protocol and domain name or IP address for the exception, e.g.:

If you are having trouble opening a jnlp file (e.g., for IPMI console access) you can try some of these steps.

Tell Firefox to allow pop-up windows for this site

Tell Firefox how to handle the filetype .jnlp

Tell it to open it with /usr/bin/javaws

Firefox Jnlp File

Jnlp Firefox Debian

Tell Java to allow the site to run applications

If you get “Application Blocked by Java Security” you can fix that by editing an exceptions list.
Modify file ~/.java/deployment/security/exception.sites

Firefox Jnlp Launch

Each line in this file should be a protocol and domain name or IP address for the exception, e.g.: