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After version 56b12 every version much slow down 57, 58, 59
firefox is cpu killer, i downgraded to version 56
i have 33 tabs on start, opening maybe same time i didnt counted
but when i change from tab to tab firefox freezing all time cpu almost 100% used, cpu all time as 2200MHz & cooler very noisy
when i downgraded to 56b12, almost all time cpu as 800Mhz & cooler quiet