I am not sure why are you using Selenium for load testing, You may wanna have a look at jmeter
Having said that, for this particular task, you can switch between tabs. You can go to any tab from any tab in Selenium.
I would assume that you have click somewhere on the first tab and then a new tab must have been opened, right ?
If that is the case, you can use the below sample code :
driver.maximize_window()
driver.implicitly_wait(30)
driver.get("Your URL here")
wait = WebDriverWait(driver, 10)
first_tab_handle = driver.current_window_handle #Storing the current or first tab windows handle
driver.find_element_by_id('some id').click() # the moment this click take place, you would see a new tab with some other or with same content (Assuming this click triggers an event)
two_tabs_handles = driver.window_handles # Note that, two_tabs_handles will have previous tab (first tab) as well as second tab handles.
driver.switch_to.window(two_tabs_handles[1]) # Note that, window_handles returns a list in python, so [0] denotes the first tab whereas [1] denotes the first tab.
#perfrom some operation here on tab 2 (e.g click somewhere to open tab3 using selenium)
three_tabs_handles = driver.window_handles
driver.switch_to.window(two_tabs_handles[2])
and so on...
PS :- Read out the comments for better understanding.
