diff --git a/firefox/src/java/com/googlecode/webdriver/firefox/FirefoxProfile.java b/firefox/src/java/com/googlecode/webdriver/firefox/FirefoxProfile.java
index <HASH>..<HASH> 100644
--- a/firefox/src/java/com/googlecode/webdriver/firefox/FirefoxProfile.java
+++ b/firefox/src/java/com/googlecode/webdriver/firefox/FirefoxProfile.java
@@ -130,6 +130,10 @@ public class FirefoxProfile {
         return extensionsDir;
     }
 
+    public void addAdditionalPreference(String key, String value) {
+        this.additionalPrefs.put(key, value);
+    }
+
     public void addAdditionalPreferences(Map<String, String> additionalPrefs) {
         this.additionalPrefs.putAll(additionalPrefs);
     }
SimonStewart: It's now possible to add a single additional preference to the firefox driver

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