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Re:A Classic Extension Reborn: Tree Style Tab by gorhill on Thursday December 07, 2017 @09:57AM (#15870466)
> I started to hit real performance issues again

What would help is to activate the Gecko profiler[1] when the performance issues occur. The cause of these performance issues might not be in Firefox itself, and the Gecko profiler would allow to find out where is the issue.

[1] https://perf-html.io/

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