[java] Passing extra options to legacy Firefox process

Author: barancev

java/client/src/org/openqa/selenium/firefox/FirefoxBinary.java

@@ -139,6 +139,10 @@ protected String getPath() {
     return executable.getPath();
   }
 
+  protected List<String> getExtraOptions() {
+    return extraOptions;
+  }
+
   public long getTimeout() {
     return timeout;
   }

java/client/src/org/openqa/selenium/firefox/XpiDriverService.java

@@ -139,6 +139,7 @@ public void start() throws IOException {
       Map<String, String> env = envBuilder.build();
 
       List<String> cmdArray = new ArrayList<>(getArgs());
+      cmdArray.addAll(binary.getExtraOptions());
       cmdArray.add("-foreground");
       process = new CommandLine(binary.getPath(), Iterables.toArray(cmdArray, String.class));
       process.setEnvironmentVariables(env);