Poor play on Mozilla's part, sure, and they paid their price. But it seems pretty damn silly to switch off Firefox for good because of this. In fact you'd be directly impacting the only browser vendor that does care about your privacy, reducing their ability to push forward with privacy focused initiatives. Talk about cutting off your nose to spite your face!

But, if you want to use a poorly maintained, out of date and insecure fork of Firefox privacy reasons (as if Mozilla is somehow terrible in this area!) then go for it, but understand you're sacrificing your security for no particularly good reason whilst simultaneously reducing their impact in influencing the design of a privacy orientated web.