diff --git a/src/BrowserTest.php b/src/BrowserTest.php
index 994f213..277f95e 100644
--- a/src/BrowserTest.php
+++ b/src/BrowserTest.php
@@ -11,9 +11,9 @@ abstract class BrowserTest extends \PHPUnit_Extensions_Selenium2TestCase{
   public function setUp(){
     $this->setHost('localhost');
     $this->setPort(4444);
-    $args=explode(' ',getenv('SeleniumBrowserArgs'));
+    $args=explode(' ',getenv('SeleniumBrowserArgsVal'));
     $args[]='screenshot';
-    $this->setDesiredCapabilities(['moz:firefoxOptions'=>['args'=>$args]]);
+    $this->setDesiredCapabilities([getenv('SeleniumBrowserArgsKey')=>['args'=>$args]]);
     $this->setBrowserUrl(getenv('SeleniumBrowserUrl'));
     $this->setBrowser(getenv('SeleniumBrowser'));
   }