i believe (but may be mistaken) that this was a goal of mozilla's positron project -- an electron-compatible runtime that uses firefox instead of chromium, but

i believe (but may be mistaken) that this was a goal of mozilla's positron project -- an electron-compatible runtime that uses firefox instead of chromium, but shares most resources across all of the positron apps running on your system so that it's more like having multiple tabs open rather than having multiple distinct instances open.