FirefoxDriver-硒和XUL

 <rows>
                        <row>
                            <spacer height=\"10\"/>
                        </row>
                        <row>
                            <label class=\"LoginLabels\" control=\"login\" value=\"&LOGIN_LABEL;\"/>
                            <textbox id=\"login\" onkeypress=\"doKey(event)\" onclick=\"return false;\"
                                     ondblclick=\"return false;\" persist=\"value\" context=\"nocontext\"/>
                        </row>
                        <row>
                            <spacer height=\"5\"/>
                        </row>
                        <row>
                            <label class=\"LoginLabels\" control=\"pass\" value=\"&LOGIN_PASSWORD_LABEL;\"/>
                            <textbox id=\"password\" type=\"password\" onkeypress=\"doKey(event)\" onclick=\"return false;\"
                                     ondblclick=\"return false;\" context=\"nocontext\"/>
                        </row>
                        <row>
                            <spacer height=\"5\"/>
                        </row>
                    </rows>

driver = new FirefoxDriver(mFirefoxProfile);
driver.get(\"/login.xul\");
driver.findElement(By.id(\"login\")).sendKeys(\'username\');
driver.findElement(By.id(\"go\")).click();

org.openqa.selenium.ElementNotVisibleException: Element is not currently visible and so may not be interacted with