You said that you didn't, and neither did I. I just don't know if anything but Chromium would be sustainable, and I still don't want to switch to Chromium. If anything, FF profiles are still a reason to use it. Even though I don't really believe FF is still much better than Chrome in terms of privacy and such (well, TBH, it still gives me peace that I can disable some stuff in about:config I almost surely couldn't in Chromium: I'd need to investigate, and it doesn't help that Chromium users generally don't bother themselves with such issues). And it hardly is in terms of actual browser technology. I didn't check if all plugins I need work under chromium, but I assume they would, since most non-major stuff was broken in FF anyway, and major stuff tends to have even better support in chromium nowadays.