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> Regardless of your H/W or S/W configuration and regardless of which browser you would like to use; you should not have crashes or notice any RAM spikes if you are SURE that nothing from the OS or other apps is connected to the internet in the background. I have had instances where I had more than 50 tabs opened simultaneously without trouble.

I have had instances where I had more than 500 tabs open simultaneously without trouble, but that was many Firefox major versions ago. The very fact that 50 is remarkable these days is strong evidence of the problems people have identified with Firefox.