Selenium opening pdf in new window

[test]

Hello!
I've been trying to use Selenium as i am unable to figure requests out (kindly help me with requests here).

I am facing the following problem with selenium:
When trying to download pdf files from multiple links on the same page, it opens the pdf in a different window and throws the following error:

Error:
Message: The element reference of <a href="javascript:__doPostBack('dtgReports$ctl03$ctl01','')"> is stale; either the element is no longer attached to the DOM, it is not in the current frame context, or the document has been refreshed

I have tried the following with no success:

profile = webdriver.FirefoxProfile()
profile.set_preference("browser.download.folderList", 2)
profile.set_preference("browser.download.manager.showWhenStarting", False)
profile.set_preference("browser.download.dir", '/home/bunni/Desktop/pat_files')
profile.set_preference("browser.helperApps.neverAsk.saveToDisk", "application/pdf")
profile.set_preference("browser.helperApps.neverAsk.openFile", "")
profile.set_preference("pdfjs.disables", True)
profile.set_preference("plugin.scan.Acrobat", "99.0")
profile.set_preference("plugin.scan.plid.all", False)
profile.set_preference("browser.download.manager.useWindow", True)
profile.set_preference("plugin.disable_full_page_plugin_for_types", "application/pdf")

browser = webdriver.Firefox(firefox_profile=profile)

Can someone please help me out here?