Martin Brinkmann at gHacks reports
Electrolysis [(a.k.a. e10s a.k.a. multi-process Firefox)] has been in development for a long time but has been prioritized only recently by Mozilla (again) after not being in focus for some time.
[...]The core idea behind the new architecture is to separate web content from the core Firefox process. The two main advantages of doing so are security and performance.
Security benefits from potential sandboxing of web contents and separation of processes, and performance mainly from the browser UI not being affected by web contents.
[...]The Are We e10s yet website lists popular browser add-ons and whether or not they are compatible with e10s yet. If you browse the list of add-ons on that page you will notice that many add-ons are not yet compatible.
Mozilla made the decision to enable e10s for Firefox Nightly versions by default with [the November 7] update. This does not mean that the last phase of development has begun and that stable users will get the feature in three release cycles, however.
[...]users can disable e10s
(Score: 0) by Anonymous Coward on Saturday November 15 2014, @05:16PM
I already have it set up to load inactive tabs (makes it a much better experience) but I don't believe it loads those tabs on a separate core, which was my point. If you have spare unused cores why not?