No Point Unless..
There is NO POINT in doing the per process unless the task manager tells the user the heading of the tab so you know which one is bad.
However, the real thing that is needed even more than that is BETTER memory management for the user, that means to recover lost memory when tabs are closed.
Right now I have 8gb of Ram, Firefox is currently using 1.9gb, it becomes unusable and I have to terminate from task manager before it gets to 3gb because if it crashes I sometimes have to go undelete the recover files in the profile. So that is Gripe 1, not being able to use more than 3gb on an 8Gb machine with plenty of memory free.
Gripe 2 is that the memory leaks away and cannot be recovered, I have a plugin that does Garbage collection etc but it only recovers a fraction. If you need to reproduce a memory leak just use firefox, open four windows, with typical sites, epecially YouTube, play videos, open suggested tracks in new tabs. Make a note of memory usage, close down all those tabs except one in each window, now try to recover your ram. YOU CAN'T
I have Tab Memory plugin and this tab is using 13mb, if I add up all the tabs in place, they of course will NOT add up to 1.9gb nor even a few hundred MB.
The other thing they need is for the plugins, they slow the load time of Firefox, so how about the default is that they load 15s after Firefox to give it appearance of speed, give user chance to nominate some that are immediately opened.
To be honest the only thing keeping me with Firefox is the plugins, they better hurry up with this update and it better be GOOD!