plugins/ByteCodeViewer/src/META-INF/plugin.xml

<idea-plugin version="2">
  <name>Byte Code Viewer</name>
  <id>ByteCodeViewer</id>
  <version>0.1</version>
  <description>Viewing java bytecode inside IntelliJ IDEA.</description>
  <vendor>JetBrains</vendor>

  <extensionPoints>
    <extensionPoint name="classSearcher" interface="com.intellij.byteCodeViewer.ClassSearcher"/>
  </extensionPoints>

  <extensions defaultExtensionNs="com.intellij">
    <errorHandler implementation="com.intellij.diagnostic.ITNReporter"/>
    <projectService serviceInterface="com.intellij.byteCodeViewer.ByteCodeViewerManager"
                    serviceImplementation="com.intellij.byteCodeViewer.ByteCodeViewerManager"/>
  </extensions>

  <actions>
    <group>
      <action id="ByteCodeViewer" class="com.intellij.byteCodeViewer.ShowByteCodeAction" text="Show Byte Code"/>
      <add-to-group group-id="QuickActions" anchor="after" relative-to-action="QuickJavaDoc"/>
    </group>
  </actions>

</idea-plugin>