Firefox opens a new tab always as I download or create a pdf inside an internet based programme, I have configured that adobe reader opens them. outside FF, but it alwasy lefts a blank tab, that is usless and i alwasy need to close it seperatly to return to original tab. So how can I achive that I stay on the same tab that I am working and not getting a blank tab? Files open normaly in adobe reader, only this blank tab is just irritating, because I need to work on a lot of files.