Process count limit

Hi,

I was reading 
https://medium.com/mozilla-tech/the-search-for-the-goldilocks-browser-and-why-firefox-may-be-just-right-for-you-1f520506aa35

Currently we have a problem with Epiphany using too much memory when 
lots of tabs are open, since -- with a few exceptions -- each tab runs 
in its own web process. This is in contrast to Chrome, in which each 
website shares the same web process.

I kinda think Chrome's approach is the best, but we don't have 
infrastructure to implement that right now. We do have infrastructure 
to set a Firefox-style process count limit. Setting the limit to four 
processes would be a simple GSettings change.

Advantage: significant memory use reduction when many tabs are open

Disadvantage: a single crashing tab will crash a quarter of your tabs, 
instead of only itself

Thoughts?

Michael