By default, latest Firefox version 52.0 disables NPAPI plugins like java, silverlight etc. These plugins can be enabled by following the below steps.
* Enter “about:config” in the address bar
* Click on “I accept the risk”
* Right click and select New → Boolean → Add “plugin.load_flash_only”
* Set the plugin.load_flash_only option to false
* Restart the firefox browser
* Open the Safari browser
* Click on the Safari tab(top left corner) → Preference
* Go to Security → Internet plug-ins → Click on Plug-in Settings
* In the left panel, enable the java plug-in. On the right side, allow the websites to use java plug-in and click on Done.
* Refresh/restart the browser.