== Quantum DOM ==
The [[Quantum/DOM|'''Quantum DOM''' ]] project will make Gecko more responsive, especially when there are a lot of background tabs open. When Quantum DOM is finished, JS code for different tabs (and possibly different iframes) will run in separate cooperatively scheduled threads; the code for some background tabs will never run at all.
Bill McCloskey wrote more about [https://billmccloskey.wordpress.com/2016/10/27/mozillas-quantum-project/ Quantum DOM on his blog].