Mozilla Firefox da <form> doldurulmuyor

        <form action="https://passport.yandex.com.tr/for/bahcecini.com?mode=auth" method="post"> 
   
              <fieldset class="clearfix"> 
   
                  <p><span class="fontawesome-user"></span> 
  				<input type="text" name="login" value="Username" onBlur="if(this.value == '') this.value = 'Username'" onFocus="if(this.value == 'Username') this.value = ''" gerekli..></p>  
                  <p><span class="fontawesome-lock"></span><input type="hidden" name="retpath" value="http://mail.yandex.com.tr/for/bahcecini.com"> 
  				<input type="password" name="passwd" value="Password" onBlur="if(this.value == '') this.value = 'Password'" onFocus="if(this.value == 'Password') this.value = ''" gerekli..></p>  
                  <p><input type="submit" name="In" value="Giriş"></p> 
   
              </fieldset> 
   
          </form>