I agree. I dont know where Mozilla is spending their money, but they are years behind in regards to security enhancements in comparison with Chrome, Edge, and IE11. Around IE7 nivea. Still waiting for 64 bit Firefox with Sandbox and per-tab-process and CFI.
I thought that's what Electrolysis was. We've switched to an ESR release with e10s disabled because of an incompatible add-on listed as compatible. Annoying, because the idea is if an add-on doesn't work with e10s, e10s will be automatically disabled. And of course in this case it doesn't since the add-on works "great" with it!
I believe the main thing Electrolysis does is split the UI and rendering into separate processes. It also creates separate processes for some other tasks. But as far as I know it doesn't give each tab a separate process.