ScriptRunner does not continue if firefox is called with <exec> task

I need to run a Selenium test suite in a headless Linux box. My configuration is ok and if I run my ant task manually everything works fine. 

But if I call the task from Cruise Control, it does execute but it never continues to the next step, just the <echo> one in the file below. My simplified ant build file looks like this: 

Any help or idea is appreciated. 

Thanks. 

<?xml version="1.0"?> 
<project name="PortalInstall" basedir="." default="build"> 
<target name="build"> 
<exec executable="firefox"> 
<env key="DISPLAY" value=":99.0"/> 
<arg file="index.html"/> 
</exec> 
<echo>Finishing...</echo> 
</target> 
</project> 

and my project section like this: 

<project name="Firefox-Call"> 
<listeners> 
<currentbuildstatuslistener file="logs/${project.name}/status.txt"/> 
</listeners> 
<modificationset quietperiod="30"> 
<svn localWorkingCopy="projects/Portal-AdminTests"/> 
</modificationset> 
<schedule interval="300"> 
<ant anthome="apache-ant-1.7.0" 
buildfile="projects/${project.name}/buildFirefox.xml"/> 
</schedule> 
<log> 
<merge dir="projects/${project.name}/target/test-results"/> 
</log> 
<publishers> ... 
... 
</publishers> 
</project>

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