diff --git a/phpunit.xml b/phpunit.xml
index 70113e8..725880c 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,13 +1,13 @@
 <phpunit
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/6.3/phpunit.xsd"
+  backupGlobals="false"
+  colors="true"
+  bootstrap="vendor/autoload.php"
+  verbose="true"
 >
 
 <logging>
-  <!--log type="coverage-html" target="report/report" lowUpperBound="35" highLowerBound="70"/>
-  <log type="coverage-clover" target="report/coverage.xml"/>
-  <log type="coverage-php" target="report/coverage.serialized"/>
-  <log type="coverage-text" target="php://stdout" showUncoveredFiles="false"/-->
   <log type="junit" target="report/logfile.xml"/>
   <log type="testdox-html" target="report/testdox.html"/>
   <log type="testdox-text" target="report/testdox.txt"/>
@@ -16,8 +16,15 @@
 <php>
   <env name="SeleniumBrowserUrl" value="https://example.com"/>
   <env name="SeleniumBrowser" value="firefox"/>
+  <env name="SeleniumBrowserArgs" value="-headless"/>
   <env name="SeleniumWindowSize" value="1024,768"/>
   <env name="SeleniumScreenshotPath" value="/tmp/"/>
 </php>
 
+<testsuites>
+    <testsuite name="all">
+        <directory>./tests/</directory>
+    </testsuite>
+</testsuites>
+
 </phpunit>
diff --git a/src/BrowserTest.php b/src/BrowserTest.php
index 11f059d..8761062 100644
--- a/src/BrowserTest.php
+++ b/src/BrowserTest.php
@@ -6,7 +6,9 @@ abstract class BrowserTest extends \PHPUnit_Extensions_Selenium2TestCase{
   public function setUp(){
     $this->setHost('localhost');
     $this->setPort(4444);
-    $this->setDesiredCapabilities(['moz:firefoxOptions'=>['args'=>['-headless','screenshot','window-size='.getenv('SeleniumWindowSize')]]]);
+    $args=explode(',',getenv('SeleniumBrowserArgs'));
+    $args[]='screenshot';
+    $this->setDesiredCapabilities(['moz:firefoxOptions'=>['args'=>$args]]);
     $this->setBrowserUrl(getenv('SeleniumBrowserUrl'));
     $this->setBrowser(getenv('SeleniumBrowser'));
   }