Can you access Skype or your banking if you disable the extension?

Too little too late with this "help" but thank you anyway. I found an online tech guy who I paid 150 bucks to sort out the problems incurred when I downloaded the nu version of firefox. I was quite frustrated and angry...and the "support" offered by firefox was pathetic. But that was yesterday. I have moved on thanks to $$ and a guy named Fayaz in Bombay.