Selenium in Python to download file: even after setting Firefox Profile the Download Window opens

Question

I am trying to use Selenium in Python to download a file from a website. In order to do that, I have read that I need to change the settings in my Firefox Profile to avoid opening the download dialogue window. I provided sample code below. This code works absolutely great at home, but it does not function properly with my work PC. I am suspecting that somehow Python can not change the settings of the firefox profile, even though the code below does not throw an error but rather works fine and in the end opens the download dialogue window.

from selenium import webdriver
import os


profile = webdriver.FirefoxProfile("C:\\Users\\Ric\\Documents\\Python Scripts\\FirefoxProfileCopies\\ric.copy")

profile.set_preference('browser.download.folderList', 2)
profile.set_preference('browser.download.manager.showWhenStarting', False)
profile.set_preference('browser.download.dir', os.getcwd())
profile.set_preference('browser.helperApps.neverAsk.saveToDisk',('application/vnd.ms-excel'))

browser = webdriver.Firefox(profile)   
browser.get("http://www.sample-videos.com/download-sample-xls.php")
elem1 = browser.find_element_by_css_selector(".push-form > table:nth-child(2) > tbody:nth-child(2) > tr:nth-child(4) > td:nth-child(4) > a:nth-child(1)")
elem1.click()

This code works perfectly with my Firefox and its profile at home, but not with my computer at work. Does anybody know why this might be? Thank you in advance.

EDIT

I tried to add all the MIME types from the Microsoft webpage, but still, the download manager window opens. When stopping the code to execute before opening the download link and trying to look at the settings for the used firefox profile with about:config the following values are displayed:

Answer 1

So, after a lot of trying, I figured to look at the firefox settings in Firefox again, since it worked with an empty profile. I managed to resolve my issue and finally have the download window disappear by going to firefox, settings and changing the settings for applications:

Then, when opening this menu, search for excel and change the values from "asking every time" to "save file/download file". Sorry if these entries in the list differ from the actual ones in firefox but my Firefox is in German. After doing this, my issue was resolved. I hope it resolves somebody else :) and thanks to anderson.