build.xml

<project name="MyProject" default="build" basedir=".">
  <description>
    simple example build file
  </description>

  <property name="build" location="build"/>
  <property name="final" location=""/>

  <target name="build">
    <!-- Delete the old build directory -->
    <delete dir="${build}"/>

    <!-- Create the build directory structure used by compile -->
    <mkdir dir="${build}"/>

    <!-- Copy chrome content (sans svn folders) to the build area -->
    <!--
    <copy todir="${build}/chrome">
        <fileset dir="chrome">
            <exclude name="**/*.svn"/>
        </fileset>
    </copy>
    --> 

    <!-- jar the chrome folder -->
    <!-- <jar jarfile="${build}/clearcache.jar" basedir="${build}/chrome"/> -->

    <!--
         delete the chrome folder (and it's contents), create a chrome folder
         and copy the jar file into it
    -->
    <!-- 
    <delete dir="${build}/chrome" />
    <mkdir dir="${build}/chrome"/>
    <move file="${build}/clearcache.jar" tofile="${build}/chrome/clearcache.jar"/>
    -->
    <!-- copy remaining content to the build folder -->
    <copy todir="${build}/chrome">
        <fileset dir="chrome">
        </fileset>
    </copy>
    <copy file="install.rdf" tofile="${build}/install.rdf"/>
    <!-- <copy file="install.locales" tofile="${build}/install.locales"/> -->
    <copy file="chrome.manifest" tofile="${build}/chrome.manifest"/>

    <!-- Zip it all up into the final product -->
    <zip zipfile="${build}/clear_cache_button.xpi" basedir="${build}"/>

    <!-- copy the xpi up a level to the build folder -->
    <move file="${build}/clear_cache_button.xpi" tofile="${final}/clear_cache_button.xpi"/>
    <delete dir="${build}"/>
  </target>
</project>