firefox on linux and STH = high cpu utilization?

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BLinux

cat lover server enthusiast
Jul 7, 2016
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i'm using Firefox on Linux. when i'm viewing threads on STH, my firefox CPU utilization seems high, like 60-80% or more. when i close the STH tab in firefox, it goes back down to 4-10%. anyone else noticing this?

I have ublock origin + noscript add-ons in Firefox. don't know if that matters, but i would think it would reduce compute resources rather than increase.