Changes to how file downloads are handled in Firefox version 98 is a breaking change. Before this, FF understood that there are 2 different reasons why a file might be downloaded:
Now under v98 both types of files are saved to the same location - e.g. my Desktop. So my Desktop is now full of files I consider to be temporary and useless!
Please restore the old behavior of 2 different locations for the 2 different types of download.