Changes

* '''Crash Rates ''' need to be low enough that they have little, if any perceivable impact to the overall crash rates. See the crash rates starting with Firefox 54 Beta, [https://sql.telemetry.mozilla.org/queries/4355#8685 here]. * Memory Total * Tab Switch Spinners '''Performance''' metrics including memory-based metrics are in the [https://wiki.mozilla.org/Electrolysis/Multi_Release_Criteria release criteria wiki page]* '''We may need to activate e10s-multi based on physical RAM size ''' depending how the number of content processes impacts such memory. We have a hypothesis for both cases (increased number of content process will either benefit systems with lower RAM or make things worse).