Opening a PDF leads to Firefox downloading it to the Downloads folder and opening it. However, when the private browsing session ends this file gets deleted again. a) This is just wrong. b) Since it is already in the Downloads folder users have a strong reason to believe they don't need to download it again. So it's even wronger. Related:
Bug 1800094 Comment 0 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Opening a PDF leads to Firefox downloading it to the Downloads folder and opening it. However, when the private browsing session ends this file gets deleted again. a) This is just wrong. b) Since it is already in the Downloads folder users have a strong reason to believe they don't need to download it again. So it's even wronger.