我想使用Firefox(54.0.1 (32-bit))和Selenium自动将文件下载到特定文件夹。现在我每次都要获取下载窗口，当我想下载文件（.pdf）并且路径始终是默认的（我想自定义它）。我尝试过的（serenity.properties）：
browser.download.lastDir = C:\\Path\\To\\The\\File\\
browser.download.folderList = 2
browser.download.dir = C:\\Path\\To\\The\\File\\
download.prompt_for_download = false
browser.download.manager.showWhenStarting = false
browser.download.manager.addToRecentDocs = true
browser.download.manager.useWindow = false
browser.download.useDownloadDir = true
browser.download.show_plugins_in_list = true
browser.download.animateNotifications = false
browser.helperApps.neverAsk.saveToDisk = text/plain,application/octet-stream,application/pdf
browser.helperApps.neverAsk.openFile = text/plain,application/octet-stream,application/pdf
browser.helperApps.alwaysAsk.force = false
pdfjs.disabled = true
plugin.scan.Acrobat = 99.0
plugin.scan.plid.all = false
plugin.disable_full_page_plugin_for_types = application/pdf
pdfjs.enabledCache.state = false
例如在Chrome中，它适用于我的设置（serenity.properties）
chrome_preferences.safebrowsing.enabled = true
chrome_preferences.download.default_directory = C:\\Path\\To\\The\\File\\
chrome_preferences.profile_default_content_settings.popups = 0
PS我已经尝试过很多来自互联网的建议，包括这个网站，但仍然没有运气。有什么建议吗？