> I put up with it's poor performance and instability merely for this one feature.

Ah, but performance and stability is exactly what Mozilla is improving with WebExtensions, Electrolysis and Servo/Quantum, so you won't need to put up with the poor performance and instability any more! What's more, it will still respect your privacy more than Chrome, be open source unlike Chrome, and allow you to configure it more than you can configure Chrome.