Forcing splinter to download a file

gistfile1.py

            cls.browser_prefs = { 
                # Silence the "Unresponsive script" dialogs
                "dom.max_chrome_script_run_time": 600,
                "dom.max_script_run_time": 600,
                "browser.download.folderList": 2,
                # We actually download CSV files from search results
                # to verify the search functionality works as expected
                "browser.download.dir": tempfile.mkdtemp(),
                "browser.download.manager.showWhenStarting": False,
                "browser.helperApps.neverAsk.saveToDisk": "text/csv,application/csv,text/plain",
            }
            cls.browser = Browser('firefox', profile_preferences=cls.browser_prefs)