Here is an example code for a simple Java-based Firefox plugin:
This is the most common architectural pattern. You develop your core logic in Java (using frameworks like Spring Boot or Micronaut) and host it as a REST API or WebSocket server. Your Firefox extension, built with standard JavaScript, HTML, and CSS, then communicates with this Java backend. This keeps your heavy processing on the server and your UI lightweight in the browser.
### Step 4: Implement plugin functionality
import com.mozilla.jpf.plugin.Plugin; import com.mozilla.jpf.plugin.PluginContext;
[Firefox Browser Process] │ ▼ [NPAPI Bridge – Plugin Container Process] │ ▼ [Java Plugin .dll/.so/.dylib (libnpjp2)] │ ▼ [Java Runtime Environment (JRE) – JVM] │ ▼ [Java Applet Execution]
#ifndef _HelloWorldPlugin_h_ #define _HelloWorldPlugin_h_
* Package the plugin into a JAR file using the `jar` command: ```bash jar cvf HelloWorldPlugin.jar HelloWorldPlugin.class
