As I’ve noted in previous posts I have been running Safari Technology Preview bought I thought I should give Firefox a try considering that the WebRender is now enabled on macOS. So far it has been very reliable and with uBlock Origin v1.32.4 it is doing a good job blocking ads and other nasties. In terms of it’s memory footprint, it is a lot more efficient than when I used it last time along with it not hogging CPU time with my current tab pretty much sitting at 0.1% with media playback still being pretty good even with YouTube being the one using the most amount of CPU utilisation due to VP9/Opus but even then, I doubt I would notice any difference if I was on battery power. One thing to remember is to install the dictionary since it relies on an external dictionary rather than using the one that is built into macOS.