Can anyone explain the relationship to the Firefox "Electrolysis" initiative better than this[0]? It looks like Electrolysis was just making the browser kernel <> IPC layer and now Fission is actually divvying up the processes by origin.
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:
>In great detail, (as of April 2021) Firefox’s parent process launches a fixed number of processes: eight web content processes, up to two additional semi-privileged web content processes, and four utility processes for web extensions, GPU operations, networking, and media decoding.
>While separating content into currently eight web content processes already provides a solid foundation, it does not meet the security standards of Mozilla because it allows two completely different sites to end up in the same operating system process and, therefore, share process memory. To counter this, we are targeting a Site Isolation architecture that loads every single site into its own process.
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.
This always was a long term goal I think. It's per site not per tab though.
Thanks for the browser work as well!