It makes FF on my high-end desktop slow too, sometimes.
In the dark reader popup window you can set the Mode; the default of Dynamic does an excellent job of making everything dark but is pretty slow. The other modes have basically no performance impact but you might see some visual bugs from time to time.
In the dark reader popup window you can set the Mode; the default of Dynamic does an excellent job of making everything dark but is pretty slow. The other modes have basically no performance impact but you might see some visual bugs from time to time.