Sometimes I download a pdf file in firefox "in new tab" so that the file is displayed immediately after downloading; it is actually not saved until I go to file menu of the pdf file and save it. Now at times by mistake I click at the "X" symbol at top right of the file and the file is closed. Then I realize my fault: the file is important and I forgot to save it before closing. Can I get back the pdf file at this stage? I vaguely remember that the file is saved somewhere by firefox itself, even if I do not save it immediately after downloading it. Can anybody please help me with this kind of problem?