This is a quick question. in my old laptap which stopped working, everytime i would open a link using the 'paste and go' feature, the link would open in the same tab i pasted the link. but in my computer when i open a link using paste and go in an already opened tab, it still opens the link in a new tab. i have gone through both the tab mix plus options and the normal firefox options but i cannot find what box to check or uncheck.

can someone please help me with this? i have come across some thread that say i will have to go to the config of FF and manually change a setting but i do not recall doing it last time.