If it works for you.. but if I tried to make Chrome do what Firefox does then i would have about 400 separate processes running. I need a multi-tool more than a race car, though Firefox ESR is not normally slow for me, even with multitudes of tabs, though having a 40core 4.3ghz CPU and 16GB ram and a SSD HD helps, thanks be to God. I just need to restart it after a good amount of use, since i rarely shutdown the PC.
But if you mainly want is speed to browse a few sites, then Firefox Quantum should be about as fast as Chrome
As I posted earlier, my eyes, not your post, votes for Chrome - not FF - as being visibly faster.
btw, Task Mgr also demonstrates FF is a memory hog.