I re-installed Firefox 37.0.2, now my Norton toolbar is gone!!

Firefox 38... was using waaaay too many CPU's and internet GB per month (I'm on a limited allotment).

My Norton toolbar disappeared. I tried everything: restarting my computer, running live update, disabling and enabling the Norton toolbar in Firefox. It shows as enabled, but it is gone.

How do I get it back on my browser?????