Correct. There is nothing that I can do about Mozilla being Mozilla. Hopefully they will add features to the new Unified Extensions Menu, such as the ability for extensions to expand into it like the Widget Overflow Menu previously allowed.
On a side note, I’ve noticed another bug in the new Firefox-ESR:
After using Firefox for a little while (I don’t know if this has to do with time spent or number of tabs opened/closed), single-taps no longer work in certain parts of the browser. For instance, if I use the Tab Manager to switch or close tabs, I will eventually need to double-tap in order for the button to be clicked. When this happens, Firefox registers a click on the button I’m tapping as well as whatever is behind the button. I’m guessing this is a touchscreen related Firefox bug.
This is really annoying, and I hope they fix it soon.