Earlier quoted context omitted.
My Pale Moon (Linux) clocks in at around 200Mb less than latest Firefox. It's faster, too. And runs the addons I want it to run. Not going back.
How well is Pale Moon patching disclosed Firefox vulnerabilities?
On the other hand, it's not moving absurdly fast and breaking things as a matter of policy like recent Firefox is.
With sensible browsing habits and a very conservative use of js, I'm confident enough, day to day.