I am at Firefox ESR 52.4. It still allows most of my add-ons to work and has the classic GUI.
I did run across a little program that enhances FF and the various renditions of it — FIREMIN. It seems to have taken control of the memory leaking Firefox has had since about version 0.7. I installed it a few weeks ago and occasionally check the FF usage through Task Manager. My FF memory usage dropped from 900meg to 15meg.
https://www.rizonesoft.com/downloads/firemin/
FYI
Yes, Firefox leaks memory something terrible. I’m going to check out your link. Thanks.
I am at 52.9.0 (64-bit) with many extensions, and multiple installs and profiles, but with 16GM of ram than the use of that is not a real problem, and so for one profile I moved the cached data to RAM in the interest of speed. This does not affect the cached date of add ons, so that such a add-on like Session Manager works fine.
When RAM use gets to high then I just hit the Memory Restart button.