Changes

* e10s-multi is currently was enabled with 4 processes in Firefox 55 Nightly * We plan on uplifting as many changes as possible to and currently beta experiments are being conducted in Firefox 54 Aurora and enabling 4 processes* If everything looks good. Read more about the experiments, we will conduct an experiment in Beta 1[https://wiki.mozilla.org/Electrolysis/Experiments#Beta_54 here].