you choice - your fud, who really cares about people ignoring fixes.A FF56 based build with a tweak or two for usability and performance and an occasional security patch.
but you never will find any (official) build which is based on v56 and get fixed. v56 i the last build with gecko, it dies with v57 which has servo as engine and no longer gecko. so there exist no code change. people need to revert or analyse v52 esr to find changes and insert them into v56 - but the possibility to make them work is very little because there were major changes between 52 and 56.
your choice, your "fud".
@JDpower - it apply to any v55, either nightly, beta or final, sounds logical!?