[znpy]

in the specific case of firefox, two different instances of firefox (no matter their version) cannot both use the same firefox profile at the same time (i tried).

You either have to ask the user to restart firefox (that would be the sane choice) or corrupt user data.

But i agree that snap sucks. Snap sucks particularly bad because they also push it where it's not only unnecessary but also detrimental to the user experience.

Simple dumb example: i had gnome-calculator in my toolbar. I sometimes need to make basic calculations, it's easy and I keep it handy. I realized that gnome-calculator (a 500k binary) was taking 30 fcking seconds to appear. Turns out it was "updated" to a snap, and now launching it meant for stuff to be mounted around and for snap to do whatever it wanted with my time.