Firefox version: 14.0.1 O/S: Windows XP Home version 5.1.2600 Service Pack 3 Build 2600

When I try to save a series of image files from the same website to a target folder using Right Click>Save Image As..., Firefox frequently (but at random intervals) forgets where the previous file was saved. I may successfully save several files to the intended folder, then find that the Save As dialog has forgotten the target folder. Sometimes, it reverts to the default Downloads folder but sometimes it reverts to a folder I used for downloads (from a different website) days ago. It may then revert to another folder I also used for downloads (from a third website), also days ago. On occasion, I have to navigate back to the intended target folder for each of a succession of downloaded files, then Firefox starts remembering where the files are going -- only to forget again, later in the series. This means I have to pay attention to what Firefox is doing and waste time checking which folder it thinks is the target, instead of concentrating on the task I am performing. I do not recall encountering this stupid, aggravating behaviour in previous versions of Firefox. So far, I have noticed it only when using Right Click>Save Image As... but cannot be certain it has not occurred with other download methods.