Why do Java, Silverlight, Adobe Acrobat and other plugins no longer work? - https://support.mozilla.org/en-US/kb/npapi-plugins

Firefox 57.0 or later is not to blame nor is it because Oracle is not support 57+. Firefox Releases since 52.0 and later has only allowed the Flash Player Plugin from Adobe to run. It even says this in the image you posted.

If you want to use the Java Plugin then you can use the Firefox 52 ESR as mentioned in bottom of above article.

Even Chrome (since 45 version), Chromium (and Opera) has dropped support of all NPAPI Plugins which includes Java back in September 2015. So basically less reason for websites to still use the Java Plugin.

Do you actually use the Java Plugin from Oracle for anything? as it is separate for the JavaScript in Firefox. Mentioning last part as so many people think one needs the Java Plugin for JavaScript to work due to the names. http://kb.mozillazine.org/JavaScript_is_not_Java

James said

Do you actually use the Java Plugin from Oracle for anything? as it is separate for the JavaScript in Firefox. Mentioning last part as so many people think one needs the Java Plugin for JavaScript to work due to the names. http://kb.mozillazine.org/JavaScript_is_not_Java

No reason, really. It just keeps wanting to update itself on my computer, and when I try, it gives me that message. I guess I won't know its usefulness unless some application comes along trying to use Java. I know JavaScript is a different animal. I think it won't be missed, and I might safely stop the updates from automatically happening. Especially if Chrome doesn't even use it. I used to write JavaScript, but haven't had to for years. So, I won't miss it. Thank you!

You may have other applications installed that need Java; but any program that "needs" Java to "do its thing" is either rather old or is "living on borrowed time".

Give this a shot - uninstall Java and see if any application that you have installed tells you it needs Java to work.

In past years I used an HTML web page building program called Arachnophilia that absolutely had to have Java installed to even work. Stopped using it due to its reliance on needing Java; switched to BlueGriffon for the few number of web pages I write. Also about 8 years ago Open Office needed Java for specific advanced features to work. Switched to LibreOffice, but for other reasons.

I haven't "needed" Java for at least the last 5 years; just haven't had it installed and don't missing not having it.

the-edmeister said

You may have other applications installed that need Java; but any program that "needs" Java to "do its thing" is either rather old or is "living on borrowed time". Give this a shot - uninstall Java and see if any application that you have installed tells you it needs Java to work. In past years I used an HTML web page building program called Arachnophilia that absolutely had to have Java installed to even work. Stopped using it due to its reliance on needing Java; switched to BlueGriffon for the few number of web pages I write. Also about 8 years ago Open Office needed Java for specific advanced features to work. Switched to LibreOffice, but for other reasons. I haven't "needed" Java for at least the last 5 years; just haven't had it installed and don't missing not having it.

Oooooooooo, great idea! I can always reinstall it if something needs it. Thank you very much.

Some sites are switching from using a Java plugin in a web page to using a technology called Java Web Start. This allows nearly the same applet to run outside of the browser in a stand-alone Java container. It's not very common yet, but you would need to reinstall Java for that.