> I'm not sure what gave me the impression but, in my mind "process-per-tab" and "Electrolysis" were linked, but that was a misconception:
Your impression was mostly correct. Electrolysis is basically process-per-tab until you reach eight tabs, but after that, tabs start sharing those eight content processes.
Correction to my earlier statement: the initial version of Electrolysis had just one content process (that could be sandboxed apart from the browser parent process), but was soon followed up with "e10s-multi" with multiple content processes.