Firefox is reported to consume excessive memory, with instances of it using around 600MB while running multiple tabs and applications. Users express frustration over this memory usage, comparing it unfavorably to PC games that require less memory. Some suggest that Firefox's design prioritizes speed by utilizing available RAM, assuming users have sufficient memory on modern systems. However, this can lead to crashes, particularly when multiple tabs are open or when certain add-ons are active. To mitigate memory issues, users recommend disabling non-essential add-ons and tweaking Firefox's settings. Alternatives like Google Chrome and Opera are suggested for their lower memory overhead. Users also discuss the frequency of crashes, with some attributing them to specific add-ons or system configurations. Overall, while Firefox is favored for its customization and flexibility, its memory consumption remains a significant concern for many users.