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Re:Firefox 73 by eitland on Tuesday February 11, 2020 @02:55PM (#22302101)
It is dependent on machine, OS and what plugins are installed.

I'm fairly certain I used to have hundreds of tabs open back in the old Firefox with even less lag than I see today.

Re:Firefox 73 by pbhjpbhj on Tuesday February 11, 2020 @04:41PM (#22303206)
I'm pretty sure it depends a lot on profile cruft too.