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Prevent Selenium from taking the focus to the opened window

I have 40 Python unit tests and each of them open a Selenium driver as they are separate files and cannot share the same driver.
from selenium import webdriver
webdriver.Firefox()
The above commands will take the focus to the new opened window. For example, if I am on my editor and typing something, in the middle of my work, suddenly a selenium browser is opening and Linux switch to that window. I am not sure if Windows or Mac have a similar problem or not.
This means that every time I run a unit, I cannot use my computer as it keeps switching away from the application that I am currently using.
How can I tell Selenium not to switch to the opened window?

Here is an example of running Selenium/Firefox on linux, in headless mode. You can see various imports as well - gonna leave them there. Browser will start in headless mode, will go to ddg page and print out the page source, then quit.
from selenium.common.exceptions import NoSuchElementException, TimeoutException
from selenium import webdriver
from selenium.webdriver.firefox.service import Service
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.firefox.options import Options as Firefox_Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support.ui import Select
from selenium.webdriver.support import expected_conditions as EC
firefox_options = Firefox_Options()
firefox_options.add_argument("--width=1280")
firefox_options.add_argument("--height=720")
firefox_options.headless = True
driverService = Service('chromedriver/geckodriver') ## path where geckodriver is
browser = webdriver.Firefox(service=driverService, options=firefox_options)
wait = WebDriverWait(browser, 20)
browser.get('https://duckduckgo.com')
print(browser.page_source)
browser.quit()
Browser can also take screenshots while in headless mode, if any unit test requires it.
A reasonably well structured documentation for Selenium can be found at https://www.selenium.dev/documentation/ (with some gaps, of course, but generally decent).

You can run your Selenium drivers in headless mode. This will prevent moving focus on opened by Selenium browsers and will not disturb you working on your PC machine.

Full screen Firefox Python Selenium

I'm trying to start a full screen page in Firefox with Selenium in Python 3. The page opening works fine, but when I send the F11 key to the browser (the Full Screen key), anything happens. Here is my code :
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
firefox = webdriver.Firefox()
firefox.get('http://localhost')
firefox.maximize_window()
body = firefox.find_element_by_tag_name('html')
body.send_keys(Keys.F11)
Does anyone know how to make my page start in full screen ? I know it's possible with Chrome, but it's harder with Firefox

This is what worked for me.
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
driver = webdriver.Firefox()
driver.get('http://localhost')
driver.find_element_by_xpath('/html/body').send_keys(Keys.F11)
Hope this helps
Just realized I am using Python 2.6 vs your 3. Sorry about that, but at least you know it will work on an older Python version

Selenium has a built-in method to make the window fullscreen: fullscreen_window()
Selenium API - fullscreen_window()
Invokes the window manager-specific ‘full screen’ operation
browser.get("https://www.screenku.com")
browser.fullscreen_window()

pip3 install selenium pyautogui
#!/usr/bin/env python3
import pyautogui
from selenium import webdriver
profile = webdriver.FirefoxProfile()
profile.set_preference("dom.webnotifications.enabled", False)
profile.set_preference("general.useragent.override", "Mozilla/5.0")
profile.update_preferences()
browser = webdriver.Firefox(firefox_profile=profile,executable_path = '/usr/local/bin/geckodriver')
browser.get("https://www.screenku.com")
pyautogui.press('f11')

Element not visible with pyvirtualdisplay and selenium in python

I'm trying a simple browser operation where I locate a username element on a website and then try to login. I'm using selenium and python to do this. Here's some simple code that works on my own local machine. The code opens a browser on my computer and then navigates to the correct username box and enters the username.
from selenium import webdriver
browser = webdriver.Firefox()
browser.get(my_url)
username_element = browser.find_elements_by_name("USERNAME")[0]
username_element.clear()
username_element.send_keys(my_username)
However, when I try to deploy the same code on an AWS server using pyvirtualdisplay so that Firefox doesn't need to pop up, it no longer works.
from pyvirtualdisplay import Display
from selenium import webdriver
display = Display(visible=0, size=(800, 600))
display.start()
browser = webdriver.Firefox()
browser.get(my_url)
username_element = browser.find_elements_by_name("USERNAME")[0]
username_element.clear()
username_element.send_keys(my_username)
The element is definitely found, but I get the element not visible error:
selenium.common.exceptions.ElementNotVisibleException: Message: Element is not currently visible and so may not be interacted with
which is confirmed by:
>> username_element.is_displayed()
False
I've tried various things I found on SO including:
making sure xvfb and xephyr are installed
adding a browser.implicitly_wait(30)
trying a WebDriverWait(browser,30).until(EC.visibility_of_element_located((By.NAME, "USERNAME"))) which times out
Any ideas on how to solve this?

You can scroll screen:
browser.execute_script("window.scrollTo(0, 600)")

Figured it out after taking a screenshot. Turns out my screen display wasn't set large enough. Changing the display size to (1600,900) solved the problem.

using selenium with python on ubuntu 14.04

I want to automate the navigation of a page, scan its QR code and then interact with it.
I am doing this with selenium and python.
But I don't see any display to scan the QR code,
this is how my code begins:
from pyvirtualdisplay import Display
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
display = Display(visible=0, size=(800, 600))
display.start()
browser = webdriver.Chrome()
What shall I do to see the display and scan QR code and resume the program?
I read examples of using Selenium on Windows in which the browser shows up automatically.

The reason is that you are using a virtual display ( i.e. headless browser ), remove these two lines and you must be able to see the browser.
display = Display(visible=0, size=(800, 600))
display.start()
Since you don't need the virtual display, remove the first line as well.

Selenium Stucks on pyvirtualdisplay

I am running Selenium python on server where I need to hide chrome display. Python script runs most of time but sometimes it stucks when it creates new chromedriver session. Don't have any idea why it stucks sometimes.
Snippet Code:
from selenium import webdriver
from pyvirtualdisplay import Display
chromedriver = '/usr/local/bin/chromedriver'
os.environ['webdriver.chrome.driver'] = chromedriver
display = Display(visible=0, size=(800,600))
display.start()
driver = webdriver.Chrome("/usr/local/bin/chromedriver") => Stuck here
driver.get("example.com")

I just currently set up Selenium on my server. If you get your permission right, try to put this line.
options = webdriver.ChromeOptions()
options.add_argument("--no-sandbox")
driver = webdriver.Chrome(desired_capabilities=options.to_capabilities())
to turn off the sandbox.