Internet Explorer (IE) has a new security feature, called ActiveX control blocking, to keep ActiveX controls, such as Java, up-to-date. This feature will prevent the app or web page from loading, if it finds that Java is out-of-date and will provide the option to update Java.
It is recommended you update Java before allowing the app to run. Click Update and download the latest Java version. If you don't trust the site or prompt, you can visit the java.com web site to get the latest version.The out-of-date ActiveX control blocking applies to:
Firefox no longer offers a version which supports NPAPI, the technology required to run Java applets. More info
Firefox implemented a new Click to Play security feature that protects against attacks, targeting plug-ins that are known to be vulnerable. This feature prevents applets from automatically loading and allows users to control what content they want to run or avoid.
» Click to Play on Firefox (mozilla.org)
Starting with Chrome version 42, Chrome has disabled the standard way in which browsers support plugins. More info
Safari allows you to configure Plugin behavior in the browser on a website basis. Please note Apple has removed NPAPI plugin support in its Safari browser version 12, and therefore Java Plugin cannot be enabled in Safari browser version 12 and above.
» Learn More