I need to save my downloads in various different folders - sometimes its a research paper, or music score, or an image and all this could go into folders for different projects. For this reason I always have "ask where to save file" enabled in the settings.

However, with that enabled, Firefox proposes some silly random folder instead of the last one used. Sometimes I have to save maybe a dozen pdfs in the same folder and Firefox proposes some rubbish random folder the first time, I change to the one I need, I save a couple of files into that folder and suddenly Firefox changes again the folder it proposes. This is so incredibly annoying. Why would they do that? But more importantly is there a way to make it just come up with the latest folder always instead? Why is this not something that can be changed directly where the "Ask where to save files" option is in the settings? Is there a good place to tell Firefox developers who utterly useless and time-wasting and annoying that behavior is?