Firefox Java Plugin Jun 2026

The Java Plugin for Firefox is . Modern versions of Mozilla Firefox (version 52 and later) cannot run Java applets via the traditional plugin architecture. This shift resulted from industry-wide security concerns and the browser industry's move away from the NPAPI (Netscape Plugin Application Programming Interface) architecture. Organizations or individuals requiring Java functionality in browsers must now use alternative technologies or specific legacy configurations.

Use modern Firefox for your daily browsing (Gmail, YouTube, Reddit). Keep a separate, sandboxed, old version of Firefox or IE strictly for the legacy site. firefox java plugin

The era of the Java applet is over. Rest in peace, Firefox plugin. The Java Plugin for Firefox is

If a website tells you that you need the "Firefox Java plugin," that site is likely a decade out of date. Contact the site administrator and ask if they have migrated to HTML5, JavaScript, or Java Web Start. If they haven't, your only option is to dig up an old, insecure browser—but do so at your own risk. The era of the Java applet is over