Your best bet with regard to add-ons (Firefox) or extensions (Chrome) is to contact the developers of each.
I am confused by "Firefox Chrome" (as the two browsers are disjoint) as well as "Quantum Chrome" as Quantum was the name given when Firefox dropped Gecko as its rendering engine, but not for Chrome. Chrome and Quantum are unconnected.
Of course, in the land of web coding, the only thing that's going to get any attention is what is current or upcoming. They'll never go back to previous versions of a given add-on/extension that have been supplanted.
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
A great deal of intelligence can be invested in ignorance when the need for illusion is deep.
~ Saul Bellow, To Jerusalem and Back