I've been waiting for a fix EXACTLY like this. Which addresses a very specific issue for me: I just can't use the "regular" fix for the current Firefox. And why not, you may ask? Because unless AND until I can get ALL of my Add-ons to be Quantum-compatible, I will NOT update to it (so yes,I'm stuck on 56.0.2). I don't care about all the great things that Quantum is supposed to bring us; my Add-ons are SINGULARLY more important to me than all of that! After all, they constitute the primary reason why I stayed loyal to Firefox for more than a dozen years.
So to be honest, Mozilla, you brought these things upon yourself. But to be fair, for this particular hotfix at least, you have my thanks.