Originally reported on Google Code with ID 8180

In firefox, if the app is not in focus, sendKeys will focus the text field, but does
not actually send the key. 
Here is a short webdriver test to reproduce the issue. 

Related: https://github.com/angular/protractor/issues/1511#issuecomment-63573621

var webdriver = require('selenium-webdriver');
var driver = new webdriver.Builder().
usingServer('http://localhost:4444/wd/hub').
withCapabilities(webdriver.Capabilities.firefox()).
build();

driver.get('https://staging.eversnapapp.com/view');
driver.findElement(webdriver.By.css('.navbar #sign-up-navbar > #navbar-registration-button')).click();
driver.wait(function() {
return driver.findElement(webdriver.By.css('#registrationModalView.modal')).isDisplayed();
});

driver.findElement(webdriver.By.css('#registrationModalView.modal form[name="regForm"]

input_last_name')).sendKeys('A user');

driver.findElement(webdriver.By.css('#registrationModalView.modal form[name="regForm"]

input_email')).sendKeys('auser@test.com');

driver.findElement(webdriver.By.css('#registrationModalView.modal form[name="regForm"]

input_password')).sendKeys('123456');

driver.findElement(webdriver.By.css('#registrationModalView.modal form[name="regForm"]

input_confirm_password')).sendKeys('123456');

driver.wait(function() {
return driver.findElement(webdriver.By.css('#registrationModalView.modal #registrationModal
form[name="regForm"] .modal-footer > #modal-register-button')).isEnabled();
});

driver.quit();

Here all it's doing is clicking on the register button so a form appears. At this point
we enter strings into all 4 fields and wait for the register button to become enabled
(which is enabled only when everything is filled out). During the test you will notice
that text is not entered into the first field, but is in the remaining 3. The reason
is that the focus is on firefox's url field until the first send key, but nothing is
entered; after that, since the focus is on the app now, additional send keys will start
working. 

Additionally, in support of the focus theory. Doing a clear before sendKeys will work,
and doing a click() before sendkeys will work. In addition, if you manually click on
the webpage the moment the browser comes up before any test is ran (to take the focus
away from the url bar) the test also passes.

OS: OSX 10.9.5
Browser: Firefox
Browser version: 33.0
selenium-server-standalone-2.44.0.jar

Reported by hankduan@google.com on 2014-11-19 01:00:51