A browser is a multi-threaded program; If I run FireFox on my PC with many tabs open, I see many firefox.exe processes in the task manager. (This is on Windows 7, I think in later Windows you need the Resource Manager to see that.) It seems that each is dedicated to one tab: if I kill it through the task manager, the page that was shown in the corresponding tab disappears, and is replaced by white page with a message like "Sorry, it seems this page crashed", and a blue button that offers you to reload it. Other tabs are not affected. I suppose the same message would be shown if the process terminated through some internal bug.
A browser is a multi-threaded program; If I run FireFox on my PC with many tabs open, I see many firefox.exe processes in the task manager. (This is on Windows 7, I think in later Windows you need the Resource Manager to see that.) It seems that each is dedicated to one tab: if I kill it through the task manager, the page that was shown in the corresponding tab disappears, and is replaced by white page with a message like "Sorry, it seems this page crashed", and a blue button that offers you to reload it. Other tabs are not affected. I suppose the same message would be shown if the process terminated through some internal bug.