Well, the title just about sums it up.
I just wanted all Opera v12 refugees to know you can find peace and comfort with the combination listed in the title. FireGestures feels just as snappy as v12 gestures, can be used to open links in new tabs, and even works on Firefox's Speed Dial equivalent, ie. when there's no actual web page open.
This is it, then. It's kind of sad to go after all these years, but I'm happy to have found a comfortable replacement for the greatest browser ever made. I was getting really worried my life on the Internet would start being really painful, but Firefox has rescued me, and for that I'm thankful. I think I'll donate to them.
Bye bye! Good luck to you all!