There are deprecated extensions that can't be ported to Quantum and were actually useful to many users. And then Quantum is a memory hog, jumping from ESR 52.9

There are deprecated extensions that can't be ported to Quantum and were actually useful to many users. And then Quantum is a memory hog, jumping from ESR 52.9 to the current version it needs a couple GB more for my workflow. It's faster and looks nice, but my computers are powerful enough to make that pretty much irrelevant. For this small speed gain and unless I switch to Waterfox or some other community effort that tries somewhat hopelessly to keep alive what many users want, I have to buy more memory and stop using FireFTP and Session Manager. I just needed Firefox, not a Chrome competitor.