Ah yes, the Mozilla Milestones of what came to be known as SeaMonkey. If the competition was flawless I'd agree. However, Netscape and MSIE also crashed constan

Ah yes, the Mozilla Milestones of what came to be known as SeaMonkey. If the competition was flawless I'd agree. However, Netscape and MSIE also crashed constantly. Opera might've been the most stable, also in the sense it was the first to have proper session management and recovery (plus it had unique features like MDI long before tabs were a thing). It took ages till Firefox once again had certain features Netscape used to have (like sharing profile over network which Netscape could with LDAP). But such was abstracted on filesystem level in the Microsoft world. An OS or browser needs a reasonable unique selling point, standards compatibility, and stability and security. Feature-wise one can slack, as long as these aspects are strong enough.