How do I set browser width and height in Selenium WebDriver?

I'm using Selenium WebDriver for Python. I want instantiate the browser with a specific width and height. So far the closest I can get is:

driver = webdriver.Firefox()

Which works, but sets the browser size after it is created, and I want it set at instantiation. I'm guessing there is an approach along the lines of:

profile = webdriver.FirefoxProfile();
profile.set_preference(foo, 1080)
driver = webdriver.Firefox(profile)

But I don't know what foo would be, and I can't figure out where the docs are.

Q1: is there a way to set width / height at instantiation?

Q2: Where are the reference docs listing all keys usable by profile.set_preference?


For me, the only thing that worked in Java 7 on OS X 10.9 was this:

// driver = new RemoteWebDriver(new URL(grid), capability);
driver.manage().window().setPosition(new Point(0,0));
driver.manage().window().setSize(new Dimension(1024,768));

Where 1024 is the width, and 768 is the height.

Try something like this:

IWebDriver _driver = new FirefoxDriver();
_driver.Manage().Window.Position = new Point(0, 0);
_driver.Manage().Window.Size = new Size(1024, 768);

Not sure if it'll resize after being launched though, so maybe it's not what you want

Here is how I do it in Python with Selenium 2.48.0:

from selenium.webdriver import Firefox
driver = Firefox()
driver.set_window_position(0, 0)
driver.set_window_size(1024, 768)

If you are using chrome

 chrome_options = Options()
 if mobile_emulation :
     chrome_options.add_experimental_option("mobileEmulation", mobile_emulation)

  self.driver = webdriver.Chrome('/path/to/chromedriver', 
                                  chrome_options = chrome_options)

This will result in the browser starting up on the second monitor without any annoying flicker or movements across the screen.

Here is firefox profile default prefs from python selenium 2.31.0

and type "about:config" in firefox address bar to see all prefs

reference to the entries in about:config:

    "": "false",
    "app.update.enabled": "false",
    "": "false",
    "browser.EULA.override": "true",
    "browser.EULA.3.accepted": "true",
    "": "2",
    "": "2",
    "browser.offline": "false",
    "browser.safebrowsing.enabled": "false",
    "": "false",
    "extensions.blocklist.enabled": "false",
    "browser.sessionstore.resume_from_crash": "false",
    "": "false",
    "browser.tabs.warnOnClose": "false",
    "browser.tabs.warnOnOpen": "false",
    "": "0",
    "browser.safebrowsing.malware.enabled": "false",
    "startup.homepage_welcome_url": "\"about:blank\"",
    "devtools.errorconsole.enabled": "true",
    "dom.disable_open_during_load": "false",
    "extensions.autoDisableScopes" : 10,
    "extensions.logging.enabled": "true",
    "extensions.update.enabled": "false",
    "extensions.update.notifyUser": "false",
    "network.manage-offline-status": "false",
    "network.http.max-connections-per-server": "10",
    "network.http.phishy-userpass-length": "255",
    "offline-apps.allow_by_default": "true",
    "prompts.tab_modal.enabled": "false",
    "security.fileuri.origin_policy": "3",
    "security.fileuri.strict_origin_policy": "false",
    "security.warn_entering_secure": "false",
    "security.warn_entering_secure.show_once": "false",
    "security.warn_entering_weak": "false",
    "security.warn_entering_weak.show_once": "false",
    "security.warn_leaving_secure": "false",
    "security.warn_leaving_secure.show_once": "false",
    "security.warn_submit_insecure": "false",
    "security.warn_viewing_mixed": "false",
    "security.warn_viewing_mixed.show_once": "false",
    "signon.rememberSignons": "false",
    "toolkit.networkmanager.disable": "true",
    "toolkit.telemetry.enabled": "false",
    "toolkit.telemetry.prompted": "2",
    "toolkit.telemetry.rejected": "true",
    "javascript.options.showInConsole": "true",
    "browser.dom.window.dump.enabled": "true",
    "webdriver_accept_untrusted_certs": "true",
    "webdriver_enable_native_events": "true",
    "webdriver_assume_untrusted_issuer": "true",
    "dom.max_script_run_time": "30",

profile = webdriver.FirefoxProfile()

write this code into setup part of your test code, before the: webdriver.Firefox() line.


 ? Configuration file to run JUnit Suite on different browsers in BrowserStack
 ? Getting different height and width in different browser using selenium webdriver
 ? How can I screenshot the full height of a mobile form factor?
 ? struggling to launch other browsers with Chimp / Webdriver
 ? How to iterate through a list of JSON elements and access their attributes using webdriverio?
 ? Chimp timing out while running in docker container
 ? Can't click an ion-side-menu button in Chimp acceptance test
 ? Running chrome in --no-sandbox mode using chimp.js
 ? Meteor acceptance testing with Chimp always gives error
 ? Make chimp execution fail if running 0 tests