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Firefox Profile

With Selenium WebDriver, it's possible to set a custom Firefox profile, which will be used during your automated tests on TestingBot.
To change preferences and settings within Firefox, you'll need to instantiate a new FirefoxProfile object and update the properties of the profile.

Change Firefox Profile

In the example below, we'll set the accept language to Spanish and change the user-agent header. 

require "rubygems"
require "selenium-webdriver"

profile = Selenium::WebDriver::Firefox::Profile.new
profile["general.useragent.override"] = "Custom-Agent"  # Change user-agent
profile["intl.accept_language"] = "es"  # Setting accept language to Spanish
caps = Selenium::WebDriver::Remote::Capabilities.firefox(:firefox_profile => profile)

caps["browserName"] = "Firefox"
caps["version"] = "latest"
caps["platform"] = "WIN10"
caps["name"] = "firefox profile example"

driver = Selenium::WebDriver.for(:remote,
  :url => "https://API_KEY:API_SECRET@hub.testingbot.com/wd/hub",
  :desired_capabilities => caps)

String URL = "https://API_KEY:API_SECRET@hub.testingbot.com/wd/hub";
FirefoxOptions ffOptions = new FirefoxOptions();
FirefoxProfile profile = new FirefoxProfile();
profile.setPreference("general.useragent.override", "Custom-Agent");  // Change user-agent
profile.setPreference("intl.accept_languages", "es");  // Setting accept language to Spanish
ffOptions.setProfile(profile);
ffOptions.setCapability("browserName", "Firefox");
ffOptions.setCapability("version", "latest");
ffOptions.setCapability("platform", "WIN10");
ffOptions.setCapability("name", "firefox profile example");
WebDriver driver = new RemoteWebDriver(new URL(URL), ffOptions);
<require_once('vendor/autoload.php');
use Facebook\WebDriver\Remote\RemoteWebDriver;
use Facebook\WebDriver\WebDriverBy;
use Facebook\WebDriver\Firefox\FirefoxProfile;

$profile = new FirefoxProfile();
$profile->setPreference('general.useragent.override', 'Custom-Agent');  // Change user-agent
$profile->setPreference('intl.accept_language', 'es');  // Setting accept language to Spanish

$caps = array(
  "version" => "latest",
  "browserName" => "Firefox",
  "platform" => "WIN10",
  "firefox_profile" => $profile,
  "name" => "firefox profile example"
);
$web_driver = RemoteWebDriver::create(
  "https://API_KEY:API_SECRET@hub.testingbot.com/wd/hub",
  $caps
);
import requests
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from selenium.webdriver.firefox.options import Options
from selenium.webdriver.firefox.firefox_profile import FirefoxProfile

# Input capabilities
desired_cap = {
 'browserName': 'firefox',
 'version': 'latest',
 'platform': 'WIN10',
 'name': 'firefox profile example'
}
options = Options()
fp = webdriver.FirefoxProfile()
fp.set_preference('general.useragent.override', 'Custom-Agent')  # Change user-agent
fp.set_preference('intl.accept_language', 'es')  # Setting accept language to Spanish

fp.update_preferences()
options.profile = fp
driver = webdriver.Remote(
  command_executor='https://API_KEY:API_SECRET@hub.testingbot.com/wd/hub',
  desired_capabilities=desired_cap,
  options=options
)
var webdriver = require('selenium-webdriver');
var FirefoxProfile = require("firefox-profile");

var capabilities = webdriver.Capabilities.firefox();
// Input capabilities
capabilities.set("browserName", "firefox");
capabilities.set("platform", "WIN10");
capabilities.set("version", "latest");
capabilities.set("name", "firefox profile example");

var myProfile = new FirefoxProfile();
myProfile.setPreference("general.useragent.override", 'Custom-Agent');  // Change user-agent
myProfile.setPreference("intl.accept_languages", "es");  // Setting accept language to Spanish
myProfile.updatePreferences();

myProfile.encoded(function (err, encodedProfile) {
  capabilities.set("firefox_profile", encodedProfile);
  var driver = new webdriver.Builder().
    usingServer('https://API_KEY:API_SECRET@hub.testingbot.com/wd/hub').
    withCapabilities(capabilities).
    build();
});
IWebDriver driver;

FirefoxOptions capability = new FirefoxOptions();
capability.AddAdditionalCapability("browserName", "Firefox", true);
capability.AddAdditionalCapability("platform", "WIN10", true);
capability.AddAdditionalCapability("version", "latest", true);
capability.AddAdditionalCapability("name", "firefox profile example", true);
capability.AddAdditionalCapability("key", "your_testingbot_key", true);
capability.AddAdditionalCapability("secret", "your_testingbot_secret", true);

FirefoxProfile firefoxProfile = new FirefoxProfile();
firefoxProfile.SetPreference("general.useragent.override", "Custom-Agent");  // Change user-agent
firefoxProfile.SetPreference("intl.accept_languages", "es");  // Setting accept language to Spanish

capability.Profile = firefoxProfile;
driver = new RemoteWebDriver(
  new Uri("https://hub.testingbot.com/wd/hub/"), capability
);